Wearing a Flag on Your Head

In Freedom City: Atlas of Earth Prime, Albania's national hero is the Albanian Eagle, a man dressed in a flight jacket emblazoned with the double-headed eagle, who projects energy wings that also look a lot like the insignia.

Real Life

In every Miss Universe National Costume competition, the Albanian contestant has always worn the flag wrapped somehow. Observe here◊, and here for example.
This is very popular with artists too.
Eliza Dushku has the Double Eagle tattooed on the back of her neck.

American Stars and Stripes

Anime and Manga

Leonard Apollo in Eyeshield 21 wore an American flag tie during the NASA Aliens' game with the Deimon Devil Bats in Japan. He's such a dick that he probably only did it to rub it into the Japanese peoples' faces, especially considering how racist he was. It's sort of hard to believe that such a huge racist could have gotten so far in America.
Jackie Gudelhian in Future GPX Cyber Formula wears the American flag-patterned trunks in EP 5 of Double-One, when he is recuperating from a crash in the race he was in.
As noted above, this is a common occurrence in Kinnikuman, but this happens most often with American characters like The Rigany or Mr. American (whose mask has the flag pattern, making this another literal example).
In the Midori Days manga, foreign exchange student Lucy wears American flag underwear.
A member of the American team in Yakitate!! Japan was wearing an American flag themed bikini while on the deserted island.
Pictured above is Bandit Keith from Yu-Gi-Oh!. The abridged series takes this and provides both the page quote and the trope name.
JoJo's Bizarre Adventure: Steel Ball Run: US President Funny Valentine has a pattern of scars on his back exactly matching the American flag. Their pattern is likely coincidence, as they were inflicted during a torture session when he was captured by Confederate forces during the Civil War.

Captain America's outfit is unsurprisingly based on the American flag. In Earth X, Cap wears an actual flag in place of his uniform shirt (he still seems to have the old pants). He's probably not in violation of the Flag Code anyway. President Osborn introduced a new, kinda ugly, flag.
There are dozens of other heroes with a flag motif to their costume, from Marvel's own Superpatriot, Defender, Jack Flagg, Free Spirit, Patriots I and II, the Spirit of '76, USAgent, etc, to DC's Commander and Citizen Steel (not to mention the original Steel), Star Spangled Kid and Stripesy, Agent Liberty, Major Victory, and Uncle Sam himself.ou
Supersoldier of the Amalgam Universe wears a Stars-and-Stripes suit somewhat similar to Captain America's, but exchanges the original shield with one bearing Superman's "S" emblem.
Nuke, a drug-fueled super-tough and utterly insane Super-Soldier hired by the Kingpin to take out Daredevil, had the American flag tattooed on his face. He also took pills, red ones to rile him up, blue ones to bring him down, and white ones to sedate him completely. At one point, while flying in an airplane, he violently insisted on knowing whether the beer he was about to drink was brewed... in America.
Wonder Woman pretty much walks around in a star spangled bathing suit, even though she's technically not an American (if you could tie her by birth to any real-life nation, it would be Greece). In the original comic book, Diana's mom made her outfit based on the fact that she'd be returning American pilot Steve Trevor to the U.S. and remaining there to assist Allied military leaders fighting the Axis. In the post-Crisis Retcon for Wonder Woman (1987) Steve's mother crashlanded on Paradise Island in the 1940s, died helping the inhabitants and thus was a honored hero whose American Flag patch was considered her personal crest.
In Astro City, the Old Soldier is a benevolent spirit that has taken part in virtually every armed conflict the world has ever known, but he started appearing draped partially in the American flag in 1775 and has never been seen without it since. Even when his conscience has occasionally forced him to fight against American troops. There's also the All-American, an American football themed hero whose athletic uniform has a distinctive flag motif to it.
- Recent issues introduced American Chibi, a Super-Deformed anime character come to life, who wears a stars and stripes design on her costume.
When Ronald Reagan appeared in Strontium Dog, it turned out his underwear was patterned with the American flag.
In The Dark Knight Returns, Ronald Reagan wears something akin to a priestly robe with a flag pattern.
In Judge Dredd, all American Judges have a Stars and Stripes pattern on their belt buckles. Judges in other areas have their own nationalistic variants.
Both the Superpatriot and Commander Capitalism, among others, in the larger Image Comics universe. Commander Capitalism probably deserves special mention: his entire costume is patterned exactly after the US flag. A field of 50 stars in the upper left and 13 stripes - anything else would just be un-American.
The cover to the first issue of Supreme Power shows the baby Hyperion wrapped in the American flag. It's much more sinister than it sounds.
Pug Davis has an American Flag on his spacesuit.
Garth Ennis' The Boys has an interesting anecdote on this trope;
"Wee" Hughie: Brits just get a wee bit suspicious when folks start wavin' flags, you know?
Mother's Milk: Don't blame 'em. Mattera fact, you might say the more you wave it, the less it means. Less you think about what it means. Start wrappin' shit up in it, wear it like some kinda goddamn suit...? Hell. Pretty soon, it don't mean nothin' at all.
In The DCU, Miss Liberty was a Revoloutionary War heroine who wore a costume modelled after the Star and Stripes, making her (in-universe) the earliest flag based costume adventurer.
When Norman Osborn founded The Dark Avengers he arranged to have plausible evil replacements for all major members of the original team to look legitimate to the public. Bullseye as the new Hawkeye, Venom as the new Spider-Man, Daken as the new Wolverine, and so forth. Unfortunately, Norman couldn't find suitable replacements for Captain America or Iron Man. Solution? Wear the Iron Man armor yourself, give it a new Red, White, and Blue paint job, and call yourself "Iron Patriot" as a Composite Character.
U.S.Avengers, in addition to a new Iron Patriot (Toni Ho) and a future version of Captain America (Dani Cage), introduced American Kaiju, a giant reptilian monster with a U.S. Flag on his chest.

The two heroines of the film Dick make flag bikinis for themselves at the end.
Abby Hoffman wears an American flag-patterned shirt in Forrest Gump at the Vietnam protest rally.
Apollo Creed's shorts in Rocky have have a stars-and-stripes pattern. He even dresses as Uncle Sam in Rocky IV. After Apollo becomes a Casualty in the Ring Rocky wears his own pair of the shorts to face Drago, the boxer to dealt the fatal blow to Apollo.
- Creed sees Apollo's son Adonis being presented with shorts patterned this way for his big match at the climax of the movie.
On the poster for Bob Roberts, Tim Robbins has an American flag wrapped around him.
Disney's Rocketman. When Fred Randall accidentally drops the flag he was supposed to plant on the surface of Mars into a deep crater, he offers a substitute: his own stars-and-stripes print boxers. How he managed to get them off without taking off his space suit is left as an exercise for the viewers.
Jeff Gorvette from Cars 2 has it in one of his doors.
Since she's Austin Powers' Distaff Counterpart in America, Felicity Shagwell from Austin Powers The Spy Who Shagged Me drives the American version of the Shaguar: a Corvette with the Star-Spangled Banner painted all over it.
In Iron Man 3, War Machine has been repainted with the American flag, as well as rebranded Iron Patriot. Rhodes gets teased for this mercilessly.
Tony: What, the red white and blue paint job was too subtle?
Rhodes: It tested well with focus groups!
Napoleon Dynamite: You think anyone wants a roundhouse kick to the face while Rex is wearing his stars-and-stripes pants? Forget about it!
Captain America: The First Avenger: In addition to Cap's uniform, the Chorus Girls in the USO show wear skimpy flag-based dresses.
Wonder Woman 1984. During his Costume-Test Montage, Steve Trevor (who's not used to this trope as he's used to fashions from the early twentieth century) takes a liking to a fanny pack with the American flag on it, describing it as "an American-issued bag" which he keeps through multiple outfits until Diana convinces him to wear a plain version.

Literature

Miss Militia in Worm wears an American-flag scarf as part of her costume.

Subverted on Top Gear (UK), where the British presenters are offered an American flag themed motorcycle to drive should their own bikes break down. In Vietnam. Naturally, none of them wants it. Of course, being dumpy white men who only speak English, most of the natives probably assumed they were Americans anyway.
Parodied on The Daily Show:
- Lampshaded by Aasif Mandvi. In this segment, involving a Muslim extremist group that sent death threats to Trey Parker and Matt Stone over depictions of Mohammed in an episode of South Park, Aasif, himself a Muslim, was upset over people using his faith as an excuse for violence.
Aasif Mandvi: Well, A, it's just so 12th Century, and B, I don't like having to walk around wearing this suit.
(Aasif turns around and shows a huge American flag appliqued to the back of his sports jacket.)
Jon Stewart: Wow. You had to have a special suit made?
Aasif Mandvi: No, it's a Tommy Hilfiger, but I had to buy it!
- One of the commercials for the show had Jon mocking other news pundits for wearing little pins of the American flag in their lapels, saying they weren't taking their patriotism far enough. He then pulled off his shirt to show he'd stabbed one such pin deep into his chest.
"Don't make me take off my pants."
Alex Wolff of The Naked Brothers Band.
In Duck Dynasty, Willie Robertson wears a Stars and Stripes bandana.
Q from Impractical Jokers has made a habit of wearing an American flag scarf.
In The Boys (2019), Homelander's cape is the American flag (in the comic, listed above, it's only stripes, but with other American imagery over the costume). Stormfront also has metal armbands with the flag stamped on them - one of the subtle clues she's borrowing imagery from unsavory sources.

Lady Gaga's video for 'Telephone.'
Keith Flint in The Prodigy's video for "Firestarter".
Mika Todd wore stars and stripes often in her Mini Moni days, as she was the only one in the group who was born in America.
Tim Garbutt of Utah Saints wore a shirt with an American flag on it in the videos for "Believe In Me" and "I Want You."
A recurring symbol for Flobots is a Stars and Stripes bandana worn around the neck.
Marina Diamandis wears a variety of Stars and Stripes clothing in the music clip for "Hollywood".
During the halftime show at Super Bowl XXXVI (the first Super Bowl after the 9/11 attacks), Bono opened his jacket to reveal the lining had the stars and stripes on it.

Pinball

Gottlieb's Rocky pinball prominently features Rocky's American flag trunks from Rocky III.

Outside of competition, The Iron Sheik, who is otherwise a poster boy for Foreign Wrestling Heel, wears an American flag as a keffiyeh. Sabu has worn an American flag in place of his usual keffiyeh, despite the fact that he is usually billed from Bombay, India
Contrary to popular belief, Hulk Hogan did not normally wear the American flag. This picture◊ and others like it are probably sources of the confusion. Also the fact that he used the guise of "Mr. America" for a Charlie Brown from Outta Town gimmick.
- He did wear as an alternative to the red and yellow an all white outfit (rip away shirt, trunks, knee pads, and boots) with the shirt having Made in America and the flag printed on it.
Lex Luger and Kurt Angle have worn outfits based on the American flag. Justified with Angle. His pro wrestling look was based on his singlet from the 1996 Olympics, where he won a gold medal in wrestling for the United States.
Both Sting and Randy Savage wore flag themed outfits on occasion in the early 90's.
WWE had a stable called the Un-Americans (Lance Storm, Christian, Test and William Regal), who wore an upside-down American flag as their logo to show how very not American they were.
Bryan Danielson, when it was decided he'd become a literal American Dragon in New Japan Pro-Wrestling.
Consequences Creed, given that he is an expy of Apollo Creed.
"Portugal's Perfect Athlete" Shanna was seen wearing the Stars And Stripes during 2010 while she was in the USA. However, she's usually a Foreign Wrestling Heel.
Claudio Castagnoli would wear the Swiss flag, if any, in his ring gear designs but started taking up the stars and stripes after becoming WWE's United States Champion.
After turning face, Nikolai Volkoff took to wearing both the USSR and American flags on his jacket and tights.
Torrie Wilson wore a skimpy American flag-patterned top hat, tuxedo jacket and bikini for the 2004 and 2005 editions of The Great American Bash.
Madusa in her second run in the WCW wore American flag themed attire, to the point that she started putting red and blue streaks in her blonde hair to add to the effect.
In the Ladies Professional Wrestling Association, Team America, a tag team duo consisting of Heidi Lee Morgan and Misty Blue Simmes, would wear tights that looked not unlike the chorus line girls for the USO shows in Captain America: The First Avenger.

In Freedom City, the various incarnations of Lady Liberty have outfits that reflect the flag to a greater or lesser extent, as does the Patriot.

KanColle has Iowa and South Dakota, both of whom are American battleships. The former wears American flag-patterned leggings and even has star-spangled eyes. The latter, meanwhile, has her colored in red, white, and blue, complete with a few stars.
Ulysses, a mysterious character from Fallout: New Vegas, wears a duster with the Fallout setting's version of the Pre-War American flag on the back. By the end of Lonesome Road, the Courier is given a copy of Ulysses's duster as well as a duster of their own with the symbol of the faction that they choose to support for the official endgame. A Courier aligned with Mr. House will get a Courier's Duster with the same Old World flag, though it grants different bonuses from Ulysses's Duster despite looking identical.
In City of Heroes, Statesman apparently used to wear a US flag as his cape, but removed it to replace the American flag atop Paragon City Hall, and in respect to Hero 1. This is used as the in-game justification for why characters cannot wear a cape until they reach level 20 and do a specific mission to earn one.
Guile from the Street Fighter franchise has a tattoo of the American flag on both of his arms.^note
Candi Suxx from Grand Theft Auto: Vice City wears nothing more than a American flag themed bikini.
Tiffany from Rival Schools wears very revealing cheerleading outfits patterned after the American flag. Now that's the kind of girl we'd like cheer for... in America!
Metal Wolf Chaos has the stars and stripes as a color scheme. As if you're surprised.
The appropriately-named Patriot from Quake III: Arena wears a flag on his head literally. The fluff says he has an overly patriotic appearance basically to make fun of the time of humans still fighting each other.
Izzy Sparks from Guitar Hero has some outfits with the American flag on them.
One character in Day of the Tentacle wears a (slightly revamped) American Flag as a disguise.
In the Hitman games, Agent Smith wears American flag boxer shorts.
Elvis from Perfect Dark wears a vest with a Stars and Stripes pattern, which has his name printed on the back. The fact that he's a Grey alien doesn't seem to bother him at all.
PAYDAY: The Heist: Dallas the professional heister's mask. In PAYDAY 2, you can make stars and stripes of different colors by using the mask crafting system and a Stars and Stripes mask pattern.
Yu-Gi-Oh! Capsule Monster Coliseum has Bandit Keith, who identifies himself as the (former) American champion.
Clownpiece in Touhou Kanjuden ~ Legacy of Lunatic Kingdom has her costume based on the American flag as a giant middle finger to the lunarians, who have the Apollo missions as a bit of a sore spot. Which is why her danmaku is also made of stars and stripes. And the danmaku of the stage proceeding her. It's awesome.
In the Dead or Alive series, we have Tina and her father Bass Armstrong (himself a Hulk Hogan Expy), who frequently wear Old Glory printed somewhere on themselves. Tina in particular has no less than 5 different bikinis with the Stars 'n Stripes on them. Then there is Mila, a massive fan girl of Tina and Bass, who as such emulates them both in dress. This despite the fact that she is from Spain.
Overwatch: McCree's aptly named "American" skin from the Olympic Summer Games event changes his poncho (red by default) to one patterned like an American flag. It also changes his the text on his belt buckle from "BAMF" to "USA" and colors the rest of his outfit red, white and blue.
It's rather subtle but the Assassin robe of Ratohnhaké:ton / Connor Kenway in Assassin's Creed III incorporates the colors of red, white and blue from the Star-Spangled Banner with a bald eagle motif on his hood.
World Heroes wrestler Muscle Power, a virtual carbon copy of Hulk Hogan, makes no effort to hide his American pride. His elbow and knee pads, wristbands, boots, and Speedo have either white stars on a solid blue field, red-and-white stripes, or a combination of both patterns.
One of the Shadowrun: Hong Kong character portraits is an orc wearing an American flag bandana on his head.
Mario wears an outfit themed after the American flag in NES Open Tournament Golf. This outfit also appears as one of his palette swaps in the Super Smash Bros. series.
Hawk Hollywood in LISA: The Painful RPG wears a flag draped around him like a shawl. You even get this shawl after his defeat, with its description lampshading its disrespectful nature. Darkly humorously, Hawk turns into a Joy Mutant on Pain Mode, with an elongated neck with this flag unfurling and flapping in the wind, rendering him not unlike a human flagpole.

Webcomics

Shortpacked!! calls on this trope when highlighting Wonder Woman's costume change.
Lee Free (the oldest one) gets all patriotic when talking about constitutional rights.

Yu-Gi-Oh! The Abridged Series is the Trope Namer.
Discussed by Pittsburgh Dad, who believes Magic Mike's American flag underwear is a desecration of the flag.
Shadowrun Storytime was a retelling of a particularly memorable Shadowrun campaign. Over the course of the story, the team takes a trip to Japan, and Dervish, the team's street sam, got into a drinking contest with a pair of truckers and managed to trigger one's allergy to grain alcohol (everyone involved was quite drunk at this point). Dervish talked the other trucker into letting him sub for his buddy and borrow his Dekotora semi while he was at it. During the "negotiation," Dervish acted like an American-turned-Sentai hero and wrapped an American flag over his head like a shemagh. Afterwards, the whole bar was chanting "America-san" to cheer him on. Dervish kept the name as a handy alias whenever the opportunity arose, and would later take to wearing an American flag bandanna.

Classic Disney Shorts: At the end of Der Fuehrer's Face, Donald Duck is shown wearing American flag pajamas after waking from a nightmare of being a put-upon Nazi worker.
¡Mucha Lucha!: Rikochet and his dad might be this (although whether it's a straight example is a bit unclear). However, given the single star on their costumes and the name of Rikochet's dad, their costumes could be Texas flags (see that section for more details).
Family Guy: In "Padre de Familia", Peter becomes an in-your-face "patriot" and shows off his American pride by wearing a stars-and-stripes suit.
Stewie: My God, you look like the Statue of Liberty's pimp.

When you're as American as Stephen Colbert, an American flag is the only◊ clothing you need.
Abbie Hoffman wore American flag print shirts, something that got him beat up by policemen because "people died for that flag." When summoned to appear before the House Un-American Activities Committee in October 1968, he was arrested for wearing said shirt. He later said "I only regret that I have but one shirt to give for my country." When Abbie wore the shirt for an interview on The Merv Griffin Show in 1970, CBS visually blurred out his image for the broadcast.
Poet Allen Ginsberg (author of Howl — "I saw the best minds of my generation," etc.) wore an Uncle Sam-style top hat as an outrageous protest back when it was considered disrespectful to wear the flag, thanks to Values Dissonance.
Amanda Tapping caused a small controversy by posing for a magazine wearing nothing but an American flag◊. Which is funny, considering that she's an English-born Canadian...in America! However, Rule of Sexy applies: Amanda Tapping is HOT.
Lord TNK made a comic showing off his cool flag designs, and they're all American flags.
Kesha's performance on SNL involved her wearing a sparkly American flag-patterned cape (in addition to another flag hanging off her mic stand).
When NHL goalie Marty Biron played for the New York Rangers, he most often used a goalie mask patterned after the American flag. Maybe it was because the Rangers were originally called the New York Americans. Maybe it was because he wanted to express fondness for America despite being Québécois. Either way, it made things interesting.
In 2010 Live Oak High School in Morgan Hill kicked several students off campus for wearing American flags on Cinco de Mayo, causing a national controversy.
- A similar case happened 3 years later.
American Girl Scouts, Frontier Girls, and American Heritage Girls all wear Old Glory patches on their uniforms.
And of course, American soldiers wear a shoulder patch depecting an American Flag. When worn on the right shoulder, the flag has to be "reversed" so that it looks like the flag is waving in the correct way when the soldier walks forward.
Old Navy stores in the US sell US flag t-shirts for five dollars each from March to July 4 every year. Generally the shirts feature an image of the flag with an Old Navy logo and the current year.
In international racing events, you will often see cars painted with American flag designs covering a goodly portion of the body, such as on the American run Ferraris in the 2012 24 Hours of Le Mans, though, in that event, the French went with French flag colored Porshe 911s covering the whole car body, instead of just the sides.
Saba Ahmed, president and founder of the Republican Muslim Coalition, wore a hijab fashioned from an American flag scarf while on Fox News in November 2015. The artist Shepard Fairey created this iconic poster of Munira Ahmed wearing a U.S. flag as a hijab scarf in 2017, based on a photo by Ridwan Adhami.
Sports trunks with a Stars and Stripes motif are common in combat sports, particularly older Mixed Martial Arts fighters such as Don Fry and Butterbean.
The USA Olympic fencing team have taken it one step further by wearing a flag pattern on their faces.
Tea Party protesters often wear flag shirts, hats or capes, or paint their faces with it.
Keith Olbermann had himself photographed sitting on the floor draped in a huge U.S. flag for his The Resistance series. It's also on the cover of his latest book, Trump Is Fucking Crazy.
Conservative spokesmodel Tomi Lahren had a sort of American Flag Angel themed Halloween costume in 2017. Both she and Olbermann have caught a bit of flak over these choices.
Atlanta based street gang Black Migos use a wavy variant of the American Flag bandana as their symbol.

Australian Blue Ensign

In the Mark Millar comic The Ambassadors, the Australian member has an outfit with the Australian flag as a shirt pattern.
In the Marvel Universe, Australian Captain Ethnic Boomerang (brash, dimwitted criminal, uses boomerangs, you know how it is) started masquerading as the heroic Outback as part of Norman Osborn's corruption of the 50 States Initiative. Outback's entire costume is the Australian flag, except with a bizarre emphasis on the British flag parts and the Southern Cross only being on his head.
In Ultimate Spider-Man the Ultimate Marvel version of the Kangaroo sports an open Union Jack vest over a sleeveless Southern Cross shirt.

Professional Wrestling

Australian Suicide got the flag put on his mask when he debuted for AAA

Captain Australia from Champions Universe. Unlike the Outback example above, her costume emphasises the Southern Cross, with the Union Jack being worn as a shoulder pauldron.
In Freedom City: Atlas of Earth Prime, the national hero of Australia is actually named the Blue Ensign, and has a costume similar to Captain Australia, above.

Captain Australia of the All-Captains Squad in The Superhero Squad Show.
A car only appearing in the Australian dub of Cars 2.

Unfortunately, thanks to a few idiot politicians like Pauline Hanson, racist yobbos have taken to wearing the Australian flag as a cape while beating up minorities and generally being a menace to society.

Brazilian Auriverde

In the Mark Millar comic The Ambassadors, the Brazlian team member has an outfit styled after the flag.

Max Cavalera from Sepultura and Soulfly displayed the Auriverde on his guitars for a while (Sepultura was the very first Brazilian band to achieve worldwide recognition, and he was quite proud of it). ESP Guitars even issued a signature guitar that sported the Auriverde. Later, he used one with the American flag... also sold as a signature guitar.

In Freedom City: Atlas of Earth Prime, the Brazilian hero Crux wears green and yellow Powered Armor.

José Carioca is very subtle about it◊, although not so subtle as to use the AMERICAN flag.
Carla Veloso from Cars 2.
Captain Brazil of the All-Captains Squad in The Superhero Squad Show.

Real Life

Brazil banned bikinis with the national flag print a few years back (because these bikinis are considered flag profanity).

British Union Jack

Anime and Manga

Hetalia: Axis Powers: In the artwork for the new version of Gauken Hetalia England is wearing a Union Jack T-shirt as part of his casual outift.
Once again in Kinnikuman we have The Jack, a minor, minor, minor choujin who failed to graduate from the Hercules Factory and literally wears the Union Flag over his entire head.
Yotsuba◊ of Sister Princess, being British born, sometimes wears articles of clothing with the Union Flag design on them.
In Kiniro Mosaic, Karen wears a Union flag blazer as part of her Custom Uniform.

In the Mark Millar comic The Ambassadors, Jamie McPhail is given a Union Jack-themed outfit after joining the team. However, he takes issue with it since he is a Scottish nationalist and gets it replaced with a Scottish flag-themed one instead.
In Black Bishop, the Union wears a full-face mask with the Union Jack on it, despite technically being a citizen of China (his father was a British secret agent who got exiled.)
Captain Britain. Sure his outfit hasn't always been a perfect Union Jack design, but it's meant to invoke the image. In the Captain Britain and MI13 series, after dying, the good Captain is resurrected by Merlin - who pulls his body together out of British flags, in order that he be one symbol representing many, like the flag itself. His sister, Psylocke, also wears a similar outfit during her brief time as Captain Britain.
Union Jack, as the name suggests, even more so. Union Jack was in The Invaders, with Captain America.
Jenny Sparks of The Authority wears a Union Flag T-shirt. In America.
Brit-Cit Judges in Judge Dredd wear a uniform which is mostly the same as those of the Mega-Cities, except the Stars and Stripes belt buckle is replaced by one with a Union Jack. (And the shoulder eagle becomes a lion.)
The Elseworlds tale Superman: True Brit told the story of Superman had he landed in the UK rather than America. Colin Clark dons a costume featuring the Union Jack on the chest - and his signature S symbol in the center. At the end of the story he emigrates to America and adopts the suit we're all familiar with.
Superman villain Manchester Black (being a Gender Flipped Take That! at Jenny Sparks) always wore a Union Flag shirt under his trench coat. The New 52 incarnation has it tattooed on his chest. In Superman and the Authority and Superman (Phillip Kennedy Johnson) it's colour inverted: the blue and red are reversed and the white is black.
The British comic Warlord featured a character known as 'Union Jack' Jackson, a Royal Marine attached to the USMC during the Pacific campaign of World War II. Although he usually wore the same uniform as the Americans, he had a Union flag painted on the front of his helmet (many of the Yanks had the Stars and Stripes emblazoned on theirs, for some reason).
In the New 52 Fury of Firestorm, Hurricane is a British Firestorm Effect whose costume has the same "circles linked by diagonal stripes" design as his international counterparts, but with red and white stripes against blue.

Fanfiction

In Light and Dark The Adventures of Dark Yagami, Noami wears knickers with a British flag on them, which she shows to Dark to prove that she's British.
Paul briefly puts a Union Jack on his illusory T-shirt in The Keys Stand Alone: The Soft World and starts singing "God Save The Queen" while he and George are larking about to annoy Spectrem.

Austin Powers' Shaguar and his Union Flag knickers.
There is a Finnish James Bond parody where Bond (played by Heikki Kahila who is better known as a newscaster and unknown in America) is wearing Union Jack underpants.
The opening action sequence of The Spy Who Loved Me ended with James Bond deploying a Union Flag parachute. It's with that scene that Bond turned from a popular character who just happened to be British to a national British icon.
Nigel Gearsley from Cars 2.

Literature

Elizabeth from Rainbow Magic wears a dress with the Union Jack printed on it, since she's the fairy who represents the Queen's Jubilee.

Amanda Holden wore a gorgeous dress mimicking the Union Jack to the finale of the 2008 Britain's Got Talent.
Mason from Dead Like Me has boxer shorts with the Union Jack on the backside.
Derry Girls: Clare wears a Union Jack tshirt to a party as a way to rise above the political conflict. Mostly just results in a lost Protestant boy mistaking her as one of them.
Doctor Who:
- "The Empty Child"/"The Doctor Dances": Rose goes to WWII London in a Union Jack T-shirt. She ends up hanging from a barrage balloon in the middle of a German air raid and notes that it perhaps wasn't such a good idea.
- "Victory of the Daleks": The two Daleks posing as British secret weapons have Union Jacks plastered over their identity tags.
Joey in Friends buys a Union Flag top hat from a souvenir stand in London. The seller tells him that all real Brits wear them. When Chandler asks why he doesn't see anybody else with one on, the man tells him that they're all tourists. Joey seems to accept this. Chandler finds it so ridiculous he refuses to be seen in public near it and ditches Joey for the rest of the day.
Tim Brooke-Taylor of The Goodies often wore the flag◊ not only as a waistcoat but flag boxers too.
Apparently, Disney Channel likes this trope. Throughout the run of Lizzie McGuire, Miranda very frequently has the British flag on some piece of apparel she's wearing.
Bear Grylls of Man vs. Wild wears Union Jack undies.
Alan B'Stard of The New Statesman was revealed to wear Union Jack boxers in a Comic Relief skit where he dropped his trousers in an attempt to proposition Mrs Thatcher.
CeCe Jones of Shake it Up (an American from Chicago) is fond of wearing the Union Jack on everything from jackets to karate uniforms.

David Bowie: The cover art for Earthling depicts Bowie in a Union Jack longcoat designed by Alexander McQueen; according to collaborator Reeves Gabriels, the outfit was intended to reconnect Bowie with England after having spent much of his life outside of the country. Biographer Nicholas Pegg also described the coat as a nod to the turbulent history of the Union Jack's meaning since the start of Bowie's career in The '60s, up to the "Cool Britannia" movement associated with Britpop (which was at the height of its popularity when the album released in early 1997).
The Union Jack became somewhat of a symbol of the band Def Leppard thanks to some iconic clothing worn in their early music videos back when MTV actually showed videos. Funny how at that time the band wasn't very popular in their home country of Britain, but they topped the charts...in America.
During the Tribute to Freddy Mercury concert in 1991 Axl Rose from Guns N' Roses wore a Union Jacket. His Guilty Gear British counterpart Axl Low wears a Union Jack shirt.
Noel Gallagher has an Epiphone Supernova electric/acoustic with the Union Jack design.
Singer Lauren Bennett wore a silver and glittery◊ Union Jack swimsuit during the Party Rock Anthem.
Ginger Spice from the Spice Girls was famous for wearing a Union Jack dress to the 1997 BRIT Awards. During their reunion in 2007 she wore a sequinned version, and for the 2019 tour it became a floor-length gown.
- Interestingly, the dress was originally just a Little Black Dress by Gucci, but Geri found it too boring, and wanted to wear something more patriotic — the Union Jack was actually a tea-towel sewn onto the front of the dress by her sister.

The British Bulldog (real name Davey Boy Smith) usually wore the Union Jack on his tights.
The former Pandora Miss Rachel often wrestles with a Union flag singlet, although its also often black.
In Progress Wrestling:
- Zack Sabre Jr. has The Union Jack on his trunks.
- Flash Morgan Webster wears a shirt with with the Union Jack on it as part of his entrance.
The WWE Raw show of October 11, 2004 took place in the United Kingdom. Ring announcer Lillian Garcia dressed for the occasion by wearing a Union Jack-patterned top.

Radio

In The Goon Show (China Story), Neddie Seagoon comments: "As I walked the streets, people seemed to know I was British. Was it my bearing? The cut of my denture? Or was it the six-foot floodlit Union Jack wrapped round my head?"

In Freedom City: Atlas of Earth Prime, the national heroine of the UK, Britannia, wears an outfit that reflects the Union Flag to the same extent as Captain Britain's, and also has the yellow-on-red lion rampant from his first costume. ^note

Doug Swallow was said to wear a shirt with this design in Phoenix Wright: Ace Attorney: Trials and Tribulations, a game that's available in America. Phoenix testified that he was wearing the shirt, but when Doug was killed he was wearing a jacket that covered the shirt. It became a bit of a problem for the case.
In City of Heroes, the legendary Hero One wore this flag as a cape.
Steve Fox from the Tekken games, as an Englishman, has one costume featuring Union Flag trunks.
In SSX 3, Brit Moby Jones' default costume has him wearing a shirt with a dicolored Union Jack on it... and one of his helmets displays the Jolly Roger. But no American flags. One of his later costume options has him shirtless, revealing a giant Union Flag pattern tattooed on his entire upper body. That's one patriotic guy. And a tough one, too; it takes a real man to brave the tundra of Alaska, which is in America, without a shirt on just to show your national pride.
Billy Kane wore overalls with a Union Jack on them in the original Fatal Fury (and KoF'95), and a sleeveless Union Jack shirt in Fatal Fury 2/Special.
Axl Low of Guilty Gear wears a Union Jack shirt.
The Hero in Fable wears Union Flag underpants.
In the first Guitar Hero game, Johnny Napalm wore a sleeveless shirt whose space was taken up by one half of the Union Jack.
Bandit Keith's medieval incarnation appears in Yu-Gi-Oh! The Duelists of the Roses with his signature bandanna replaced by a Union Jack, 300 years before the union of the crowns.
In The Darkness 2, the Darkling wears a Union Jack jacket.
One of the unlockable costumes of Tomb Raider: Legend is a Union Jack shirt.
In Yandere Simulator, one of the members of the Cooking Club, Seiyo Akanishi, wears a kerchief with the UK flag on it. He's obsessed with everything western and is stated to use Gratuitous English in his speech.
In Street Fighter 6, British bombshell Cammy White sports a blue biker jacket with the Union Flag emblazoned across the back.

Webcomics

Cream Tea of Apricot Cookie(s)! has bows in her hair with the Union Jack on them.
It's hard to tell, because the only color used outside of Dream Sequences is red, but the bandanna of London-born protagonist Liz in the Zombie Apocalypse webcomic Dead Winter is probably supposed to be a Union Jack.
"Union Jackie" is a character from Fans!.
Tom from Khaos Komix sometimes wear a torntshirt with a Union Jack on it.
In Girl Genius one of the Harbor Master's men is wearing a shirt designed to look like the Union Jack.

Danielbeast from lonelygirl15 wears Union Jack boxers, but only when he has no alternative, like American flag boxers.

Mad Mod, the recurring Evil Brit villain on Teen Titans (2003).
On Phineas and Ferb, British-American Ferb has the Union Jack on one of his shirts (seen in "The Baljeatles"), as well as his skateboard ("Picture This"). He also gets one in the background of his Rousing Speech in "The Lizard Whisperer" when a truck with the image coincidentally stops behind him.
Foster's Home for Imaginary Friends: The character Euro-Trish is a conglomeration of European stereotypes, and she has a Union Jack t-shirt.
In Superman vs. the Elite, Manchester Black has a large Union Jack tattoo that covers most of his torso.
In ¡Mucha Lucha!, when trying to pick a theme for a new Luchador via throwing a dart at a wheel with various themes on it, the dart misses the wheel completely and ends up hitting a globe, sticking into England. They decide to just go with that and naturally the new wrestler both has a Union Jack on his costume and even goes by the name Union Jack.

This flag design◊ originated from a poll to design a version of the flag with a dragon on it to represent Wales; clearly the Tengen Toppa Gurren Lagann fan-base got hold of it.
Union Jacks are connected to the British Punk movement and Mod styles in America, so it's considered fashionable in some groups.
Most Fook Mi and Fook Yu cosplayers including Yaya Han◊ worn a Union Flag belt buckle.
Old Mini Coopers with white roofs were and are still fit with aftermarket Union Flag decals on top, making the car practically wear a flag on its head. The new Mini can be ordered with a factory-fit Union Flag.
Like most national flags, the Union Flag flown upside-down is a distress signal at sea. The problem is that this is a fairly subtle distinction, involving the width of the diagonal white stripes, and most people wouldn't recognise it if they saw it
Note that the Union Flag and the red-on-white Cross of St George denote the UK and England, respectively. The St George's Cross was rarely seen until recently, but it is making a definite comeback. This is hampered by bad PR: the St George's Cross is tainted somewhat by its association with movements of a Right-Wing Militia Fanatic bent.
Unlike other countries, the British national flag only really comes out in public on days of appropriate significance (National and Royal occasions). There is a deep but unspoken suspicion of people who feel a need to fly it all the time, and the American custom of flying it continually and universally is something that baffles British minds. Going to American extremes has attracted a slightly derisory name: Flag-shagging.

Canadian Maple Leaf/l'Unifolié

Anime and Manga

In Hetalia: Axis Powers, Canada puts a sticker of his flag on his forehead to distinguish himself from America, since no one ever noticed him. (If they did, they would simply mistake him for America.) However, America sticks the American flag on his head saying it makes him more awesome.
Canadianman in Kinnikuman's entire costume is patterned after the Canadian flag. His special moves include the Canadian Backbreaker and swinging an axe like a lumberjack.
- It should be noted that the Canadian Backbreaker is an actual wrestling hold, not something made up simply for the character.

Comic Books

The old (late 80s/early 90s) Alpha Flight uniforms had a maple-leaf motif on them, making them look like the flag of Canada:
- Weapon Alpha/Vindicator/Guardian (and he went by the latter two names twice!) and his red-white-maple-leaved costume. The trope was actually discussed somewhat in his origin story, noting that Canada didn't have the type of flag code restrictions that the United States have. His Ultimate version follows suit even though each of the Ultimate Alpha Flight members have their own peculiar costumes.
- When Heather (who first took the name Vindicator after Mac's apparent death) took the name Guardian, the recently-returned Mac (who went back to Vindicator) wore a version with the red and white switched (since Heather had the original design). After he returned a second time, Heather (like the rest of the team) was wearing the standardized (and distinctively different enough) team costume, allowing Mac to return to his original look. Heather's geothermal suit from the second series was green and white.
There are also various Canadian superheroes such as Captain Canuck and the like and wear the Maple Leaf with pride to show that they're the toughest Canadian not called Wolverine (or Deadpool) there is in North America.

In Turning Red, Mei wears a maple leaf shirt to bed and wears a toque with a maple leaf design to school. Also multiple background characters wear shirts with maple leaves or the Canadian flag on it.

The Kevin Smith episodes of Degrassi: The Next Generation played with this; Jay wore a Canadian flag tuque, and Smith mentioned that he wanted to have a Canadian flag in every shot of the movie he was there to film.
The picture of Don Cherry on the Hockey Night In Canada works page.

Trish Stratus fought at least one match while wearing a pair of butt-hugging Canadian flag-themed shorts. It was truly a glorious sight to see.
Dark Angel while in the Mexican LLF. Later wore the flag on her tights along with Taylor Wilde in TNA after being unmasked and revealed as Sarita.
Impact Power Stable Team Canada all wore outfits adorned with Canadian-flag imagery. What else did you expect, eh?
Variation, Allison Danger added some Blue to the Red and White when she teamed up with Sara Del Rey.
Edge wore Maple Leaf tights during the February 20, 2023 edition of Monday Night Raw, which took place in Ottawa, Ontario, Canada.

Stand-Up Comedy

One Canadian comedian, after mocking Canada's not-so-impressive military strength, proposes the alternative of firing everyone in the military and spending the entire budget on making one bionic Super-Soldier who wears a Canadian flag as a cape.

In Freedom City, Johnny Rocket enemy and anti-American villain Mad Maple wears a maple leaf costume. In Atlas of Earth Prime, Miss Canada and Big Thunder of Team Canada (an Alpha Flight expy) wear reversed-colour flags.

In Age of Mythology, entering the code "O CANADA" will give you a bear that shoots lasers and wears a Canadian flag cape.

In Yu-Gi-Oh! The Abridged Series, Bandit Keith wears one after the credits of the episode where he admits he's actually Canadian... in (North) America!
In the Whateley Universe, "Captain Canada!"^note has an outfit and round shield that's a blatant ripoff of the Captain America costume, except for the Canadian flag. It's lampshaded repeatedly. The other Canadian mutants at Whateley Academy think he's an embarrassment.

In The Super Hero Squad Show, Wolverine, a Canadian, had to wear a modified version of his costume that is in Canadian colours (basically the Guardian costume with Wolverine's distinctive cowl) during an episode that has him join the various national Captains like Captain America.
In Total Drama, a show taking place in Canada, Owen wears a blue maple leaf on his shirt. According to his Island bio, it's a Toronto Maple Leafs jersey.

Canadian travellers abroad used to sew the Maple Leaf on their backpacks so as not to be confused with Americans. Nowadays this seems to be more common among American travellers pretending to be Canadian while not in America.
Fans of Tim Horton will wear Canadian flags in Buffalo, New York, due to the proximity of the Canadian border.
On Canadian money, the buildings have the Red Ensign flag flying over them, but this looks so much like the American flag from a distance that everyone thinks they printed the American flag on Canadian money! New bills were issued in 2005.
Shawn Ashmore once posed for a magazine wearing nothing but the Canadian flag.
The NHL's Toronto Maple Leafs proudly wear the Maple Leaf on their chests, albeit coloured blue rather than red. The team and its insignia predate the Maple Leaf flag by many decades.

Confederate Battle Flag

Anime and Manga

Gorgeousman from Ultimate Muscle wears the Confederate flag as his costume.

In American Honey, the character of Krystal is wearing a Rebel flag bikini when she tells Jake to apply tanning lotion to her body.

The Dukes of Hazzard: General Lee's paint job, due to the show's cartoonish representation of the American South.

There's also a Captain Confederacy comic book. Knowing the independent comic landscape in the 80s, which is when it seemed to have been published, it's not unlikely that it came out only in America.

Professional Wrestling

"The Wild Eyed Southern Boy" Tracy Smothers often has some Confederate pattern somewhere on whatever he is wearing.
Bubba Ray Dudley (now know as Bully Ray) wore one early in his career, with the explanation that he was the son of Big Daddy Dudley and a southern woman.
The Briscoe Brothers (who teamed with Bully Ray in Ring of Honor) often have a combination of the Confederate and Union flags, most memorably on Jay's "World" title belt.
Jessie Bell Smothers, usually, and sometimes Anabella Smothers too, them having a deep south gimmick, as well as claiming to be the illigitimate daughters of Tracy Smothers. Daddy loves his maybe daughters, daww!
TNA put Jacqueline in one, against someone's better judgement. Though it didn't last.

Toys

G.I. Joe H.A.V.O.C. driver Cross-Country toys, mainly sold in America, wear a confederate flag belt buckle. A later toy featured him in a Civil War Confederate jacket with the flag printed on the back, and the aforementioned belt buckle. In the first case, "Heritage, Not Hatred" is stitched under the flag to let you know he's not a complete lunatic. Both figures also sport grey Confederate kepi caps.

The Confederacy in Starcraft had the Confederate flag applied to armor. Expanded universe content from the series shows they were big fans of putting it on everything, really.

This trope is quite common in the American South.
The Confederate flag is known only as the Rebel Flag by many, thus associating with a general attitude of rebellion rather than the true history of its origin, leading to it being seen in places that were Northern states during the Civil War, places that weren't even part of the US during the Civil War, and even places that have never even been part of the US, such as Canada.
- Rebel flag bikinis exist for Southern girls to wear down to the lake.
Fans of Country Music, Rockabilly and classic American cars in Europe often wear the flag as a subcultural symbol.

Dannebrog

Comic Books

In Femforce, the Danish superheroine Valkyra (who is secretly the Nazi supervillain Panzer) wears a costume modelled after the Danish flag.

Webcomics

As seen in Scandinavia and the World, it's Flag Day Every Day.

The Danish flag (dannebrog) is for some reason considered more to be a general symbol of joy than a national symbol, leading to it being traditionally displayed in miniature on Christmas trees, birthday cakes and party accessories, and being waved obnoxiously in the face of friends returning from overseas in the airport.
Football brings out dannebrog facepaint, shirts, flags worn as capes and the ever-present red-and-white clapping cat.
It's also flown in pretty much every garden, with actual laws regulating when and how to fly it.

Estonian Sinimustvalge

At one famous anti-Soviet rally in Estonia, because flying their traditional blue, black, and white flag was forbidden by law, they instead flew three flags: a blue flag, a black flag, and a white flag.

European Union Star Halo

In Nextwave, Elsa Bloodstone famously wore an EU t-shirt on one of the team's excursions, eventually causing her to say "Victim? Do you think this letter on my chest stands for America?!"
In Judge Dredd, Euro-City Judges are sometimes shown with the star halo on their helmets. (Other times, the helmet visor itself is star-shaped.)

In Freedom City: Atlas of Earth Prime, the European is a Polish pro-EU terrorist who attacks symbols of nationalism in EU countries (basically a Flag-Smasher expy with a weird focus). His costume has the star halo in a yoke going round his shoulders.

It is not a country, but this does not mean that no embarrassing nationalism exists, such as in the form of Captain Euro, who is in no way related to the infinitely manlier Captain America.

German Bundesflagge

Anime and Manga

Schwarz Bruder from Mobile Fighter G Gundam wears a mask with the color arrangement of the flag of Germany. Perhaps if he wore an American flag pattern instead, he wouldn't have died.

Music

Done very interestingly in the video for the Rammstein song "Deutschland". Germania, the embodiment of Germany, is played by black actress Ruby Commey; combined with the red-and-gold motif of her outfits throughout the video, she is the German flag.

Webcomics

In Kiwi Blitz, Heinrich wears German flag boxers on one page.

Max Schnell from Cars 2.

Germans usually are not very fond of displaying flags, and when they do it's usually regional or local flags, since the last time the country went through a craze of flags and national symbols, it ended up very badly for everyone. Except when the national football team is playing in an international competition. Then you see the three colors everywhere and on everything! It probably has been copied from football fans of other nations, like England or Brazil, who have been appearing in stadiums in their national colors for much longer. Germans see it as a way to support their team, having nothing to do with national pride.
Formula One driver Sebastian Vettel wears the German flag as an element in his helmet designs.

Israeli Star of David

Sabra, the national superhero of Israel in Marvel Comics, wears a Star of David-themed costume.

The Israeli flag itself is an inversion - its design is based on the tallit, the Jewish prayer shawl. Rather than using a flag for clothing, they used clothing for a flag.

Japanese Rising Sun

Anime and Manga

In Hetalia: Axis Powers Korea give suggestions for uses of the Japanese flag such as wearing it as a t-shirt.
Saber Rider and the Star Sheriffs: The leader of the group has a headband with a red dot, like the Japanese flag. In the American version, it became a fireball, and a westerner (albeit an Englishman) became the supposed leader, because that's what we want to see in our American cartoons.
Hatabō from Osomatsu-kun has a miniature Japanese flag pinned to the top of his head.

Quick Kick, G.I. Joe's Japanese-Korean/American martial arts expert, often wore a Japanese flag headband in the comics.
Sunfire from Marvel Comics has had costumes inspired by the Japanese naval ensign (the version of the Japanese flag with the red rays extruding from the sun). The armor of his cousin, the Silver Samurai, also features a similar motif.
Hondo-City Judges in the Dreddverse wear white one-piece uniforms with a red circle on the chest, meant to evoke the Japanese flag.
Fuji of Stormwatch has a Japanese flag pattern painted on his face. Icons: The DC & Wildstorm art of Jim Lee shows that in the original concept for Stormwatch, the entire Multinational Team wore their flags on their faces.
Valiant Comics characters Bloodshot and Rai have nanites that turn their skin bright white with a red dot on their chest.
- Rai takes it one step further with a red dot on his forehead and even further in the rebooted series with his chest emblazoned with a WWII-era Japanese flag.
The DC Comics character actually named Rising Sun has an appropriately designed costume.

The Adventures of Buckaroo Banzai Across the 8th Dimension: Buckaroo Banzai, son of a Japanese father and American mother, wore a Rising Sun bandana when he tested the Jet Car and the Oscillation Overthruster.
The Karate Kid. Daniel's headband has a reproduction of the Japanese imperial seal imprinted.
Shu Todoroki from Cars 2.

Visual Kei arm bands with with a Rising Sun or Japanese Flag design are around, but I think they're actually sold more on sites that ship to America, or cater mainly to Americans, like Lolita Kisama. I made one with the rising sun and "Japan Land of The Rising Sun" written on it in Japanese.
an early iconic look for Frank Ocean included a Rising Star bandana made by Supreme as a folded headband.

Samurai Goroh from F-Zero wears a Japanese flag on his head, as does his son Daigoro. Good to see he's taking fashion tips from me, in America.
In Super Mario RPG, boss character Boomer has a Japanese flag imprinted on his head for no conceivable reason besides his resemblance to a samurai, even in the American release.
Fatal Fury's Joe Higashi and The King of Fighters' Goro Daimon also wear Japanese flag headbands. In some artworks, Joe's bandanna has the kanji for flame instead of the Hinomaru.
Genji's Summer Games skin from Overwatch colors his body to resemble the Japanese flag, making him all white apart from a few red circles.
In Street Fighter, Rainbow Mika's tag team partner Yamato Nadeshiko wears a wrestling costume based on the Japanese flag.

Web Animation

Homestar Runner: Pom Pom, when showing of his mastery of martial arts, suddenly acquires a Japanese flag headband.

Soldiers often wore their nation's flag as headbands.
A headband with the rising sun seems to be a standard motif.
The launch version of the Honda Fit's trunk badge had the "I" dotted with a rising sun. When Honda launched the Fit in America it was changed to a blue dot to appease American buyers who wouldn't want to fly a foreign country's colors.
Japanese Bento lunches sometimes have an Umiboshi (A salty sour pickled plum) in the center of rice. It's there for two reasons, 1) Flavor, 2) It resembles the Japanese Flag. American lunchboxes have to make do with the occasional flag-frosted cupcake, usually available only around the Fourth of July.
pro-skater Chad Muska borrowed the design for his iconic skate deck that is still one of the best selling skate decks of all time.

Korean Taegukgi

Anime and Manga

Chijimiman from Kinnikuman wears the yin-yang center on his breastplate.

In the Mark Millar comic The Ambassadors, the team leader, Korean tech genius Choon-he Chung, wears an outfit styled after the flag that's almost all-white except for three stripes on each upper arm and the yin-yang symbol on her chest.

Fan Works

In Amazing Fantasy, Vulture has the flag stitched into the back of the jacket of his Powered Armor.

Professional Wrestling

Mia Yim has wrestled with the flag fastened to her shorts.

Kim Kaphwan from King Of Fighters has the yin and yang part on his uniform, while his student May Lee has it on her belt

Mexican Tricolour

In the Mark Millar comic The Ambassadors, the Mexican member of the team, Chico Blance, has an outfit styled after his country's flag, like the other members.
DC Comics once introduced a bunch of international heroes in their Annuals one year, including three new Mexican heroes. Most of the heroes had their national flag as the background of their book's cover. Since it's illegal for anyone to use the Mexican flag in anything but an official capacity, DC had to change the cover of the book when it was released in Mexico.

Professional Wrestling

Diana La Cazadora's green gear set includes the tricolor in heart symbols.
The "Mexicools" Super Crazy, Psicosis and Juventud Guerrera during their feud with The Full Blooded Italians.
"Los Mexico Amigos", a quartet of wrestlers from All Japan who all took up Spanish names and wore the Mexican flag on their tights. "¡Viva Mexico!"
To help with the Heel–Face Revolving Door of the World Wrestling League, La Real Fuerza Aérea wore the colors of the Mexican flag while wrestling in Puerto Rico.

In the Dream SMP, Mexican Dream^note has the Mexican flag — or at least, a simplified version of it, since it takes place in Minecraft — painted over his Dream blob (or mask, depending on the interpretation) on his Minecraft skin. Glatt (the ghostly form of Jschlatt) later claims that he has the Mexican tricolour draped around his shoulders, which would likely be the more realistic interpretation of the skin.

A car only appearing in the Mexican dub of Cars 2.

There was a case in which Paulina Rubio, a pop singer, caused controversy because of a picture taken from her only covered with the flag.
Spanish Burger King restaurants promoted a "Texican burger" with a cowboy and some other guy dressed in a serape with the Mexican flag on it.
Juan Escutia, one of the Niños Héroes, is often shown throwing himself from the Chapultepec Castle, wrapped in a Mexican flag to prevent the American troops from taking it.
Like other Latin American presidents, the President of Mexico wears an official sash decorated with his country's national colors, in this case red, green and white. The Mexican sash also bears the national emblem of an eagle eating a snake.

Norwegian Nordic Cross

In Pushing Daisies, the Norwegian detectives have a SUV-based lab painted with the Norwegian flag, and always dress in jackets that make them look like they're members of the Norwegian Olympic Team. Disappointingly, the American detectives do not follow suit.

In some American colleges run by the Evangelical Lutheran Synod (largely populated by Norwegians), the Norwegian flag is flown on campus next to the American flag, and the bookstore features many items (including clothing) emblazoned with the Norwegian flag.
In Norway, strings of small paper Norwegian flags are a traditional Christmas-tree decoration.

Flag of Puerto Rico

In Grand Theft Auto IV, some civilians can be seen wearing shirts with the Puerto Rican flag design on them. This started a weird rumor from fans who didn't check their facts that Captain America was an unlockable character in the game.
One of Miles Morales' suits in Spider Man 2 PS 5 is the Boricua suit with the Puerto Rican flag on his chest. This is unlocked after completing all the Brooklyn Visions missions.

Professional Wrestling

Wrestlers Eddie "Primo" Colon and Savio Vega both use ring gear designed from the flag. TNA's Homicide wears a bandana designed from the flag. Some wrestlers in Puerto Rican promotions have done this too, such as El Illegal Chicano in WWC and IWA. Though sometimes he opts to wear the flag itself instead.
Juan Fiero has both a singlet and mask patterned after the Puerto Rican flag.
Shane The Glamour Boy is Canadian but more likely to be seen wearing the Puerto Rican flag and sometimes even tells people he's from Puerto Rico.
Shawn Hernandez wears the Puerto Rican flag on his tights, which makes sense, seeing as he is Puerto Rican. What doesn't make sense is that Hernandez has a Mexican gimmick.(TNA is the culprit in that case)
Mercedes Martinez, sometimes subtly, sometimes overtly.
The Puerto Rican flag makes up half of Eddie Kingston's pants legs.
Black Rose mainly outside of Puerto Rico, as in WWC and IWA she sided with Dominican groups against the island.
Sensational Carlitos has a set of ring gear that is the basically the Puerto Rican flag from the neck down. His adversary, Mr. 450, has a very similar outfit.
Ivelisse Vélez's SHINE merchandise includes a shirt with the flag on it.

Real Life

A lot of Puerto Ricans from the island tend to wear clothes designed from the flag (bandanas, shirts, etc.).
Around June, and throughout summer, actually, in NYC, expect a lot of flag wearing.

Quebec Fleur-de-lis

Literature

The Witch of Knightcharm: A rookie witch at an evil Wizarding School wears the Quebec flag on her head as a symbol of her devotion to the cause of Quebecian separtism. She explicitly says she only joined the school so she could get strong enough to make the seccession possible.

In SSX Blur, Felix Levesque wears a hat with a strong Quebecois flag motif.

Everywhere. The Québécois are extremely nationalistic, and Quebec flags are seen on articles of clothing (and everything else) pretty much all the time, but especially around the holiday of St-Jean-Baptiste (particularly as a Take That! to Canada).

Soviet Red Banner

Comic Books

X-Men: Colossus always wears a red and yellow costume to represent his Soviet roots.

Professional Wrestling

Nikolai Volkoff, who would also ask that you stand for his singing of the Soviet national anthem...NOT!. He hated having to do that and is glad the union fell.
Colonel Ninotonchka in GLOW, until she left the USSR and moved to France.

Tabletop Games

In Freedom City, the Cold War era Soviet hero(?) Bogatyr wore a Red Banner costume.

Video Games

"Cold War" is one of the unlockable camouflage suits in Metal Gear Solid 3: Snake Eater. It's a combat suit with the entire front end painted in a Soviet flag while the back is covered with an American flag. The joke is that since the enemy soldiers are Russian, they will hesitate to shoot you when you're facing them with their flag showing, but will be more than happy to shoot as soon as you turn around and reveal the American flag. It may seem like a Joke Item at first, but it's actually useful in the rail-shooting portion of the game, especially if you're going for a Pacifist Run. There are also unlockable face paints of the flags of various countries, including the United States, Great Britain and the Soviet Union... In Soviet Russia! Though these face paints are actual Joke Items, as there are no in-game advantages to using them whatsoever.
In Command & Conquer: Red Alert 2, the Soviet Premier wears hammer and sickle boxers.
Zangief in Street Fighter wears an outfit that has the Soviet colors of red and yellow. It's become rather outdated since his home country is no longer the Soviet Union since it dissolved in 1991 with his nationality being solely Russian (although Capcom kept him a Soviet as far as 1994).
For some reason, Soviet heroes are EXTREMELY popular in City of Heroes; naturally, many wear the flag as a costume.

Real Life

While Russia has moved on from the old days, the USSR is a thing of the past, and the nation has adopted a new national flag, there is one big exception. It cannot be ignored or glossed over that the Great Patriotic War was won by something called the Red Army that marched under a blood-red banner, and the annual Victory Day parades in May on Red Square see the modern Russian flag taking a back seat, while the USSR's Red Flag is flown in profusion and with great pride.

Spanish Rojigualda

In Freedom City: Atlas of Earth Prime, the Spanish superhero siblings El Abanderando and El Menina (the Standard Bearer and the Maid of Honour) wear costumes with a yellow top, red tights/skirt and red shoulder pads.

In Punch-Out!!, boxer Don Flamenco wears shorts with the colors of the Spanish flag, though inverted.

Texas Flag

Music

Willie Nelson has been quite fond of this. If he's not wearing a Texas bandanna, expect to see a Texas flag in the background while he's performing.

Command & Conquer: Red Alert 2:
- Whenever you see General Carville, you'll see his "Don't Mess With Texas" flag mug.
- In the opening cinematic, you see a highway sign emblazoned with the Texas Flag reminding drivers to "Drive Friendly, The Texas Way!" shortly before a Soviet tank runs it over. The sign, of course, is a real highway sign displayed at state border crossings.

¡Mucha Lucha!: Rikochet's (and his father's) costume might be this. His costume is red, white, and blue, and his mask has a star. Granted, it might be an American flag, but given the fact that there's only one star on the entirety of the costume and the fact that his dad is named Lone Star (as in Texas, the Lone Star State), it's more likely to be this.

Texas State Guard members wear Texas flags on their uniforms, which are otherwise identical to active military and National Guard uniforms. In the civilian world, this is sometimes misconstrued into a belief that soldiers from Texas wear the Texan flag patches instead of American flags.
Big Tex, the iconic (and huge) statue from the Texas State Fair, wears a button-up shirt patterned like the Texas Flag.
Many products in Texas have a Texas flag somewhere on them, although generally as a part of the design and not as THE design.
Really, you can find the Texas Flag all over the place if you look hard enough, although most Texans likely filter most of it out because it's always been that way, and thus, by its very nature, is not worth noticing. The filter lifts upon crossing state lines, so the humor can once again be appreciated when one encounters a sequined Texas flag handbag in a department store in Colorado!

Other

In the Mark Millar comic The Ambassadors, the indiviual members (some listed in other flag sections) wear outfits based on their respective country's flags. Some not mentioned in other listings:
- Codename France has a red, white and blue outfit matching the pattern.
- Codename India has one based on the Indian flag.
In New 52 Stormwatch, Jenny Quantum, Singaporean successor to the Union-Flag-wearing Jenny Sparks, wears a hoodie with the crescent-and-stars. Hilariously enough, this is actually illegal for most of the year in Singapore.
A flashback in Batman Incorporated features a UK superhero team called the Victory V's. Rather than the usual Union Flag, their leader, Mr Albion, wears a St George's Cross on his uniform.
Judge Dredd:
- The Cal-Hab Judge uniform differs from the standard Brit-Cit version (above) by having a St Andrew's Cross across the chest, with the badge in the centre, and a Lion Rampant belt buckle. And a kilt.
- The Murphyville Judge-Sergeant uniform has a sergeant's chevron in the colours of the Irish Tricolour on one of the shoulder-pieces.
- Nu-Delhi Judges have the Ashoka Chakra on their shoulder-pieces.
The immortal Scottish guardian Saltire, in the comic of the same name, is completely coated in blue woad, with tattoos including a St Andrew's Cross on his chest. Oddly, he's supposed to predate Christianity coming to Scotland.
In Knight and Squire, Captain Cornwall and his sidekick Cornwall Boy wear costumes with Saint Piran's Flag.

In A Bit of Fry and Laurie's "Treaty of Westphalia" sketch, the characters representing England, Sweden, and France all wear badges depicting their flags. Hugh Laurie's France wears the Tricolore in a bit of Anachronism Stew.

Music

Kneecap (Band): DJ Próvaí always wears a balaclava in the style of the Irish tricolour flag.
Shakira recorded "Waka Waka (This Time For Africa)", the official song for the 2010 FIFA World Cup in Africa. In the video for the song, she wore a top decorated with the Pan-African colors (red with some green and yellow ribbons).
Shirley Bassey sang in the opening ceremony of the 1999 Rugby World Cup wearing a Welsh flag dress.

Batista has the Philippine and Greek flags tattooed on his left biceps, as a tribute to his mixed heritage.
All Elite Wrestling star Nyla Rose is of Iroquois, specifically Oneida, descent. Her entrance video and some of her ring outfits feature the design of the Iroquois Confederacy's flag.

BattleTech has Janos Marik, who has the national emblem for the Free Worlds League tattooed on his forehead.
Freedom City: Atlas of Earth Prime:
- The Venezuelan national hero El Bolivarano wears a costume based on the eight-star tricolor.
- The mysterious Maltese protector the Knight of Malta, of course, wears a surcoat with a Maltese cross.
- The Ghanaian hero Exampler has a costume based on the flag of Ghana.
- The Russian heroine Bogyatr II wears a shirt in the colors of the Russian Federation flag, as a reference to her father's Red Banner costume.

Webcomics

In Arthur, King of Time and Space, British characters in the space arc wear badges of their flag if they're a king, or their liege's flag otherwise (usually Arthur, but there are exceptions; Mark's retainers all wear the standard of the Duke of Cornwall, as do Guenevere and Lancelot when they're exiled from court and taken in by Tristram and Isolde.) The Pendragon flag is green and red quarters, a simplification of one of the traditonal arms of Arthur, which quarters the Virgin Mary on a green field with three crowns on a red field. In the baseline arc, Arthur is also shown wearing a tabard in these colours when he was a squire.
Everyone in Scandinavia and the World wears their flag as a shirt. Except North Korea, who appears draped entirely in his/her(?) flag, leaving only a pair of eyeballs visible.
Same applies to everyone in Flagland, seeing as they are all countries.
Also in Polandball, where everyone is a ball with their nation's colors.
In Baskets of Guts, this overlaps with Goofy Print Underwear: Rikleeno's underpants are dotted with bourbon lilies.

In the WWE series, most recently WWE 2K14, the creations mode, including custom championship, allow the option of importing any flag of any country on it.
Many characters in Overwatch gained a skin to the color of their country of origin with the Summer Games event. Widowmaker got the French flag, Torbjorn the Swedish one, Mercy the Swiss, etc...
Arno Dorian in Assassin's Creed: Unity incorporates the French Tricolour into his Assassin robe.
Turians in Mass Effect almost always sport facepaint. Digging into the Encyclopedia Exposita reveals that this is a holdover from their extremely nationalistic pre-unification days: the facepaint of a turian is that of their home colony. Because a turian without facepaint is keeping their allegiances hidden, "barefaced" is a slang term for "untrustworthy" (or "politician").
Grand Theft Auto V allows the player to buy a parachute bag in the color of any independant nation, and some more. American Flag liveries also exsist in GTA Online for multiple vehicles and weapons, and a generous amout of clothes bearing the flag including a bandana headcover.

Francesco Bernoulli, Raoul Caroule, and Rip Clutchgoneski from Cars 2.
Captain Lichtenstein of the All-Captains Squad in The Super Hero Squad Show.
Unstable Fables: Crystal Tortoise doesn't wear a flag on her head, but her top and skirt are covered in flags from almost every nation in the world.
In Baymax!, a trans man who offers Baymax advice on buying menstrual hygiene products is wearing the trans pride flag as a shirt.
Work It Out Wombats!: The yellow sun on JunJun's shirt is meant to evoke the sun on the flag of the Philippines.