%% Image format kept as is per Image Pickin' thread: http://tvtropes.org/pmwiki/posts.php?discussion=1310559261018532300
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[[quoteright:200:[[Film/SupermanTheMovie http://static.tvtropes.org/pmwiki/pub/images/clark_kent_outfit.jpg]]]]
[[caption-width-right:200:[[MuggingTheMonster Yeah, you could probably take this guy in a fight...]]]]
[[quoteright:200:[[Film/SupermanTheMovie http://static.tvtropes.org/pmwiki/pub/images/reeve_superman2_9974.jpg]]]]
[[caption-width-right:200:[[Franchise/{{Superman}} Or... maybe not.]]]]

->''"Sensei, the truth is, I actually look thinner wearing clothes!"''
-->-- '''Takamatsu from ''Anime/AngelBeats'''''

So there's this character on TV, and he looks like a [[YiddishAsASecondLanguage nebbish]]. He's rather nerdy, pretty scrawny, not too attractive, and likely to faint at the mere sight of blood. What a geek, huh?

...Until he takes his shirt off, and -- surprise -- he's [[HeroicBuild packed]]! He's got abs of steel, his guns are fully loaded, and he can probably crush coal into diamonds with his massive pecs... Good Lord, he's a GeniusBruiser who's been hiding the "Bruiser" part all along!

A Clark Kent Outfit is, basically, any article of clothing that hides a character's well-toned physique from the audience, setting audiences for a surprise when it's used, especially for harmless-looking fellows. Can apply to women as well, often leading to a BeautifulAllAlong moment when PlayedForDrama or HiddenBuxom when PlayedForLaughs. Or both.

Note that while the actor has to be able to fit into the physique-concealing costume when this trope is used in live-action works, no such restriction applies to other media, and thus it's possible to have a character reveal muscles (or curves) [[CostumesChangeYourSize that couldn't possibly have fit inside the outfit]] they were wearing beforehand. This can be PlayedForLaughs.

Compare with BadassBookworm. Not to be confused with ClarkKenting, which has the opposite effect.



[[folder:Anime & Manga]]
* ''Manga/{{Bleach}}'': Captain Yamamoto wears robes almost all of the time and appears to be a stooped-over old man. When he removes his robes, he reveals that he's completely ripped.
* ''Manga/FullmetalAlchemist's'' Edward Elric is a short, intellectual teenager, but so incredibly buff under his jacket that he ends up [[ShirtlessScene shirtless]], like, almost every other fight scene. It's also initially done to hide his automail arm and leg. By the way he runs around before it's revealed, you'd never guess he was a double amputee.
* ''Manga/DragonBall'':
** Master Roshi, a scrawny little hunchbacked pervert who almost ''doubles'' in height, shoulder width and muscle mass when he first takes off his shirt. Roshi can also [[GrowingMusclesSequence expand]] his muscles at will.
** For an in-universe example, Gohan's high-school outfit almost [[https://vignette.wikia.nocookie.net/dragonball/images/8/8a/GohanOrangeStarSchool.png/revision/latest/scale-to-width-down/211?cb=20100317104211 looks like it's a size too large]], undoubtedly to help hide the fact that he's built like a... well, [[https://pbs.twimg.com/tweet_video_thumb/DA1grENW0AA8t1t.jpg like a Saiyan]]. It works, too, at least enough to make Videl initially think he's harmless.
* Takamatsu from ''Anime/AngelBeats'' tears off his shirt dramatically in the middle of class and reveals a very muscular figure in episode 5. No-one cares.
-->'''Takamatsu:''' Sensei, the truth is, I actually look thinner wearing clothes!\\
'''Teacher:''' I see that, sit down.
:: Then when he rejoins the group no one cares about his reveal and Yuri just chastises him for not thinking of a better distraction.
-->'''Takamatsu:''' I thought it would be surprising, that no-one would see it coming, I train in secret...\\
'''Hinata:''' Yes yes, put some clothes on.
* At the end of the second season of ''Anime/DarkerThanBlack'', this is done by Kirihara's new boss, who looks like Manga/{{Golgo 13}} if he was a staid Japanese bureaucrat. He takes off his shirt and reveals he's really ripped and he wields a {{BFG}}.
* Kamishiro Yuu from ''Manga/{{Holyland}}'' looks harmless under his school uniform, but, as his opponents quickly learn and a classmate who grabbed his arm once commented, his muscles are rock-hard from all of that street fighting.
* ''Manga/SayonaraZetsubouSensei'':
** The teacher Jinroku is a friendly and unassuming guy who is balding and wears glasses. Under his shirt though, he's fairly muscular (certainly compared to 90 pound weakling Nozomu) and has a large {{Yakuza}} tattoo.
** Ditto with Abiru's father who has a similar "weakling {{salaryman}}" kind of look. While the rumors he abuses Abiru aren't true (he's a great guy; she gets her injuries from pulling animals' tails), it is true that he belonged to a black ops squad that knew how to kill people with [[ImprobableWeaponUser moe manga]].
* Jiji from ''Manga/IchiTheKiller'' is a tiny old man, but when he takes off his shirt he has a bodybuilder's physique, and {{neck snap}}s a {{Yakuza}} [[CurbStompBattle without breaking a sweat]]. It helps that he's really only 30 years old, but got plastic surgery to make his face appear older.
* Enishi and Hiko Seijūrō XIII of ''Manga/RurouniKenshin'' wear cloaks most of the time, and pretty much look like slim {{bishonen}}. When both take off those cloaks, they are extremely muscular. This is sort of plot important because Kenshin's lithe frame puts him at a disadvantage when fighting either of them, since his body isn't really meant to be performing those strenuous sword-fighting maneuvers.
* Kotetsu T. Kaburagi from ''Anime/TigerAndBunny'' appears to have normal, even lanky, physique... until the [[ShirtlessScene shirt comes off]] and it becomes apparent he's, well, [[HeroicBuild a superhero]].
* ''Manga/{{Naruto}}'', quite a few characters invoke this trope.
** Naruto the titular protagonist has an average baggy build [[https://pbs.twimg.com/media/CxgX0zRXAAA4dPI.jpg with his clothes on]], and wasn't considered attractive by most girls in Konohagakure... pity they never saw him with [[http://i0.kym-cdn.com/photos/images/original/001/070/566/552.jpg his shirt off]].
** Jiraiya, a 50 year old ninja wears an outfit that makes him look flabby and yet underneath he's [[https://vignette.wikia.nocookie.net/dogs-of-war/images/4/4e/Jiraiya-gif-jiraiya-34683481-500-251.gif/revision/latest?cb=20151002210402 rocking a six pack and biceps]].
** Hinata Hyuga's uniform is more about [[ShrinkingViolet her shyness]] than a secret identity, but her bulky jacket and loose pants are definitely designed to [[HiddenBuxom hide]] her [[MostCommonSuperpower physique.]]
* Dr. Stein from ''Manga/SoulEater'' is surprisingly ripped for a creepy MadScientist, as his ShirtlessScene in the anime reveals. The same goes for Ox Ford, one of the DWMA's students, which the manga shows in a ShowerScene.
* Lithuania from ''Webcomic/AxisPowersHetalia'' is cute, slender and [[DudeLooksLikeALady feminine-looking]] and he's most often seen as a secretary or domestic housekeeper. However, as he was once a knight and still does martial arts, he's very muscular upon closer inspection.
* ''Manga/AttackOnTitan'': Every character that's enlisted in the military actually undergoes heavy physical training so they are able to properly control the 3DMG. As a result, most soldiers have really sculpted physiques. This, however, is only shown in a few instances, and characters are most often shown wearing their uniforms.
* Joujirou from ''Anime/{{Charlotte}}'' is actually fairly toned, which he explains as helping reduce the damage from his SuperSpeed ability. Yuu [[LampshadeHanging hangs a lampshade]] on it when he sees Joujirou shirtless in Episode 5.
* Midoriya in ''Manga/MyHeroAcademia'' gets a lot of muscle after his training with All Might but it's concealed by whatever clothes he is wearing (including, for some reason, his form-fitting gym clothes).
* ''Manga/BlackClover'': Asta's clothes hide his muscular physique despite how apparently thin they are.
* Hajime from ''Manga/ICantUnderstandWhatMyHusbandIsSaying'' is shown to be quite muscular due to working from home and having plenty of time to work out. Hilariously, his wife was unaware of his physique despite their active sex life (they always keep the lights off).
* In ''Anime/MobileSuitGundamWing'', [[TheStoic Trowa Barton]] appears as thin as the rest of the G-boys. But when we see him in ''Anime/MobileSuitGundamWingEndlessWaltz'' wearing a [[WalkingShirtlessScene very revealing circus costume]] he's [[HeroicBuild positively ripped]]! Its no wonder that he can beat a group of thugs to a pulp with his bare hands.
* In ''Anime/MobileFighterGGundam'': Major Ulube, while a military man, is retired from actual combat and mostly seems to stick to politicking and administration. It comes as a shock in the late stages of the anime when he reveals he is still in extremely good physical condition, good enough to go toe-to-toe with some of the strongest Gundam Fighters on the planet.
* ''Anime/OnePiece'': Thanks to the NoodlePeople art style this trope happens a lot.
** Sanji with his suit on is [[http://bdn.i.ntere.st/p/13875261/image skinnier]] than Usopp, with [[https://i.ytimg.com/vi/0sc-0may4FM/maxresdefault.jpg his suit off]] he's about muscly as Zoro.
** Luffy is even more scrawny and doesn't wear bulky clothes, but being a RubberMan Luffy can inflate his muscles [[GrowingMusclesSequence whenever he wants]].
** Tasihgi is a good female example as unlike a good percent of women in One Piece [[http://neoapo.com/images/character/16713/d73887e6ef04b369a526cf4494da3195.jpg she doesn't dress scantly]] and is more reversed with her body, of course she's actually [[https://i.pinimg.com/564x/44/b5/90/44b5901307d443e1ab8346ba4b17a15c.jpg buxom as hell]] but [[HiddenBuxom hides it with her clothes]].
* ''Webcomic/OnePunchMan'': Both Saitama and Silver Fang have impressive physiques that are usually hidden by their clothing. Even Saitama's superhero outfit is too baggy for his muscles to show (except on rare occasions during a dramatic ArtShift.)
* In the manga of ''Manga/KenichiTheMightiestDisciple'', his fellow classmates don't realize how ripped he is until they all go on a beach trip. It's not intended on Kenichi's part. The training his masters have him on have made him densely muscled, and he only has people much stronger than himself to compare against. Because of this, he mostly still acts like the meek boy he always was, and his school uniform always hung loose on his small frame.

[[folder:Comic Books]]
* ''Franchise/{{Superman}}'':
** Superman is the TropeNamer, as his alter ego, Clark Kent, is modeled specifically for this purpose; namely, a spineless man (with glasses, of course) to hide his superhuman strength. ''ComicBook/AllStarSuperman'' has him wearing multiple layers of clothing to appear ''flabby'' rather than skinny. In some depictions, his glasses are also used to hide eyes so incredibly blue and bright they clearly aren't human.
** In ''Comicbook/SupermanBirthright'' his mother Martha specifically ordered him to never wear T-shirts in public ever, since X-ray vision isn't needed to see his six-pack.
** Somewhat averted in the '86 reboot. As Clark, he kept weights in his apartment to make it appear that he simply works out in order to obtain his muscular physique and prominently displays football trophies from high school to make him appear to be an ex-jock.
* ''Comicbook/{{Supergirl}}'':
** Pre-Crisis Supergirl wore very plain clothes, long-sleeved blouses, and long skirts to hide her muscles.
** Subverted in ''[[Comicbook/{{Supergirl 1972}} Supergirl Vol 1]]'', in where she wears tight clothes which make nothing to hide her figure or her muscles. However, she doesn’t stand out because most of the people she meets are well-built. In ''[[Comicbook/{{Supergirl 1982}} Volume 2]]'' she wore long dresses again.
** [[ComicBook/Supergirl2005 Post-Crisis]] "Linda Lang" wears long shirts and trousers to cover her athletic, fit body.
** In ''Comicbook/SupergirlRebirth'', Kara's SecretIdentity wears loose clothes and baggy trousers to hide her super-strong physique.
* ''ComicBook/SpiderMan'': Peter Parker is a less emphasized example, but few would guess that his regular clothes hide a sinewy physique.
** Back when Creator/SteveDitko was still drawing ''Amazing Spider-Man'', his costume did the same thing.
** A fan asked Stan Lee why none of Peter's classmates could see his muscles, Lee answered by stating if they ''felt'' his muscles they would see that ''Puny Parker'' is actually very buff.
** There was an issue of ''Spectacular Spider-Man'' where a private detective has deduced who Spider-Man is, and suggests that Spidey (who he remarked was built very lean, but "like a Ferrari") would most likely utilize baggy clothes to hide his physique. Unfortunately for him, [[spoiler:he deduces that ''Jameson'' is Spider-Man. Jameson is most likely not amused.]]
** In ''ComicBook/UltimateSpiderMan'', Gwen notes that Peter's "all muscle" when she, Peter and Eddie Brock are crammed into the same car. He claims to be into pilates.

[[folder:Fan Works]]
* John's cloak in ''Fanfic/WithStringsAttached'' makes him look like his normal, skinny Earth self. Take it off, however, and he's a [[WingedHumanoid winged demigod]].
** Played for laughs in ''Fanfic/TheKeysStandAlone: The Soft World'', because practically every time John takes his cloak off in front of someone, [[{{Squee}} they gasp or squeal]] or otherwise express... ''considerable'' admiration.
* ''Fanfic/LastChildOfKrypton'': Shinji wears shirts, baggy pants and multiple layers of clothing to hide his super-human muscles. The only time he wears -reluctantly- a skintight [[LatexSpaceSuit plug suit]], Misato and Ritsuko note that he's shockingly brawny and muscular.
-->'''Maya:''' Wow.\\
'''Misato:''' Yeah, puberty hit that kid like a freight train, didn't it?
* ''Fanfic/SOE2LoneHeirOfKrypton'': Asuka uses her regular school uniform and loose clothes to hide her muscular, sinewy physique.
* A sidestory of ''Fanfic/PokemonResetBloodlines'' has a minor example with RecurringCharacter Jeanette Fisher, who usually wears a kimono attire. Her traveling companion, A.J, gets the chance to see her without it and his thoughts imply she has a nice figure.

[[folder:Films -- Live-Action]]
* ''Film/SupermanTheMovie'': Possibly the greatest success of the Christopher Reeve movies was that he could pull off both meek Clark Kent and Superman and still fool people on the set into thinking that he was two different actors. Sure, the ClarkKenting jokes still won't stop, but people generally agree that Reeve made it believable.
* One of the best examples comes from the 1985 Creator/JackieChan[=/=]Creator/SammoHung action comedy ''Film/MyLuckyStar''. Michiko Nishiwaki, in her first film role, is seen in the first part of the film wearing a kimono and acting in a very stereotypically demure Japanese lady-like way. And then she takes off the kimono. To understand the significance of this, Michiko Nishiwaki was Japan's first female powerlifting champion and the nation's first female bodybuilding champion.
* Standard in any Creator/BruceLee movie. Since he tends to play [[BewareTheNiceOnes Nice Guys who are pushed too far]] he would almost always begin his movies in slightly baggy clothing to hide the fact that he looks like he was twisted out of steel cable.
* The Creator/JohnRitter comedy ''Skin Deep'' had Ritter's character pick up an attractive blonde at a bar. When they get back to the bedroom, she takes off the dress. She was played by Raye "Zap" Hollitt, later one of the first ''Series/AmericanGladiators''.
* Early in ''Film/ThePrestige'', the protagonists have to work out how a weak old magician can hide a full fish tank. Turns out he's actually strong enough to grip it between his legs, pretending to be weak every minute of every day of his life.
* In Creator/PeterDavid's novelization of ''Film/SpiderMan2'', Jameson taps Peter Parker on the chest and is momentarily taken aback to discover "the seemingly scrawny Parker had pecs that felt like metal slabs".
* ''Franchise/MarvelCinematicUniverse'' does this trope well.
** Tony Stark aka [[Film/IronMan Iron Man]] doesn't ''look'' like a powerhouse, nor does he need to be physically fit since he has PoweredArmor and yet underneath his business suit he's pretty muscly, kudos to Robert Down Jr for keeping fit in his 50s.
** Creator/ChrisPratt playing Peter Quill aka ''Star Lord'' in Film/TheGuardiansOfTheGalaxy initially looks no different from his flabby ''Series/ParksAndRecreation'' character Andy... [[https://www.usmagazine.com/wp-content/uploads/chris-pratt-inline-2.jpg till his clothes are taken off]]. Very impressive since Chris lost 60 pounds in six months for the role which is inspiring.
** Peter Parker aka [[Film/SpiderManHomecoming Spider-Man]] looks [[https://www.celebsclothing.com/product_images/w/793/Homecoming_Spider_Man_Grey_Cotton_Jacket__99711.jpg completely average]] while wearing normal clothes but when [[ShirtlessScene shirtless]] Peter [[http://pixel.nymag.com/imgs/daily/vulture/2017/04/18/18-spiderman-holland.w710.h473.2x.jpg is stacked]] very fitting for the character and impressive on Tom Holland's part.
* ''Film/IchiTheKiller'': Jiji, the little old chessmaster, wears baggy clothing throughout the film. At the very end, he strips to his underwear to reveal a ridiculously muscled body.
* Referenced in ''Film/JuliaMisbehaves'', in which Julia meets Fred, an acrobat, on a boat trip to France. Julia flirts with Fred, complimenting his physique (despite Fred wearing a baggy suit and turtleneck), but she probably fell for this trope as much as the audience, since she is pleasantly surprised when she feels Fred's muscly bicep, and practically {{squee}}s on the spot.

* Belgarath from Creator/DavidEddings' [[Literature/TheBelgariad Belgariad/Mallorean/prequels]] is apparently ripped. He tends to wear loose, scruffy robes and drink a lot, so not obvious when other characters see him, but it becomes noticed when he de-robes to get in the water.
* Weird example with Sazed in ''Literature/{{Mistborn}}''. Sazed always wears robes an is usually genuinely very skinny. However, he can become physically strong and very muscular by using his feruchemic powers to tap stored up strength and muscle-tone. Since Sazed tends to fight shirtless, the effect is that he is a skinny guy when clothed, and a muscular guy whenever the text describes him taking off his robes.
* In ''Literature/ProvenGuilty'', Charity gets a moment like this. While everyone's gearing up to storm a faerie stronghold, Harry tells Charity that, being a {{housewife}} and not a trained fighter like himself, Thomas, or Murphy, she should stay behind. Then she takes off her baggy sweater to start armoring up, and Harry notes that she "won some kind of genetic lottery," and that she's also ripped and muscled up. She then explains that not only does she make her husband's steel plate mail armor, but she's the one he spars and practices against.
* In ''Literature/TheOdyssey'', Odysseus's beggar rags hide his fit physique. When he discards said rags to fight a lout named Irus, the witnesses are shocked at the powerful muscles that were hidden by the rags.

[[folder:Live-Action TV]]
* Carlton in ''Series/TheFreshPrinceOfBelAir''. He may be short, but he could still make a fair amount of men feel pretty inferior about their bodies.
* A possibly unintentional example; Xander from ''Series/BuffyTheVampireSlayer'' is fairly ripped for a [[HollywoodHomely supposedly unattractive]] geek. Up until the season 2 episode [[Recap/BuffyTheVampireSlayerS2E20GoFish "Go Fish"]] Xander's outfits were scruffy oversized Hawaiian shirts. Then he joins the swim team. Even Cordelia looks interested.
* Nerdy Billy Cranston from ''Series/MightyMorphinPowerRangers'' is often seen wearing baggy overalls and shirts that are a size or two too big. This is to hide the fact that his actor, David Yost, is a professional gymnast and built like a plow horse. As time went and Billy became more skilled at fighting he gradually wore clothing that showed off his physique more.
* In one episode of ''Series/{{Friends}}'', Phoebe is dating two men at the same time, one of whom is very sensitive while the other is very buff. Deciding to choose brains over brawns, she tries to dump the buff guy... until he also turns out to be very sensitive. That means he has more advantages than the sensitive guy, right? Well, when Phoebe goes to his house to dump him instead, she sees him shirtless for the first time, and, well... this trope happens.
* Creator/CrispinGlover as he [[http://www.youtube.com/watch?v=ALapHYNSmoA infamously appeared on]] ''Late Night with Creator/DavidLetterman'' looked especially scrawny, and he was just wearing a short-sleeved T-shirt... until he tried to challenge Letterman to arm wrestling, at which point Glover pulled up his sleeve and showed off his ridiculously muscled biceps to the audience.
* Oddly, Jenny's fiancé from the first season of ''Series/TheLWord'' is like this. Any scene where he takes his shirt off is hard to pay attention to while trying to figure out where he'd been hiding those incredibly well-developed arms.
* ''Series/{{Dollhouse}}'' has a subtle example in "Briar Rose" that pays off in a ''major'' way a few minutes later.
* Jack Hodgins on ''Series/{{Bones}}'' is all geek, but in the first season Christmas episode he takes off his shirt and is very buff indeed.
* In ''Series/StargateSG1'', Daniel Jackson wears baggy shirts for the first few seasons of the series and fit the stereotypical nerd profile, but later on he TookALevelInBadass and gets to show off some impressive biceps.
* Jimmy Palmer from ''Series/{{NCIS}}'' is revealed in season 9 to have a great set of abs. To Abby, and even Gibbs comments.
* Solonius from ''Series/SpartacusBloodAndSand'' looks like a typical spoiled, scrawny aristocrat. In his final episode, he's sentenced to fight in the GladiatorGames, and he's revealed to be incredibly ripped.
* Dr Martin Dear in ''Series/GreenWing'', as we see when he poses for a life drawing class.
* ''Series/DoctorWho'': The Fourth Doctor -- although he's less buff than solid and sinewy, there's no way you'd know underneath sixteen feet of garter stitch and layers and layers of Regency clothing. This is why "The Deadly Assassin" gives him a scene where he's dressed only in slim-cut trousers and a Mr. Darcy shirt and [[SexySoakedShirt has him get soaking wet]] during a fight scene.
* ''Series/HerculesTheLegendaryJourneys'':
** In-universe, Atalanta in "Let the Games Begin". She is wearing a dress until she challenges her nephew to arm-wrestling. Her nephew is in shock when he sees how buff she is.
** Another in-universe example in "If I Had a Hammer...". Atalanta is again in a dress, until she gets involved in a fight. After the fight (where her dress is torn off), her boyfriend left her as he had no idea how buff she was.
* In the first episode of ''Series/LoisAndClark'', Lois accidentally walks in on Clark shirtless in the bathroom at his apartment. Needless to say, she was surprised at what she saw. Even more so when she goes to get a drink out of his fridge and finds it's filled to the brim with junk food. She later asks him how he's able to eat like an eight-year-old and still look like "Mr. Hard-Body".
* Early on in ''{{Series/Arrow}}'', Roy Harper tells Thea that he considers Oliver to be "a bit of a wimp". Nobody would accuse Creator/StephenAmell of looking overweight or unfit, but his 'civilian' attire at this point seems to consist entirely of suits, which, as discussed in the Real Life section below, can conceal the finer details of a man's physique pretty well.

[[folder:Video Games]]
* ''VideoGame/MassEffect2'' gives the male Shepard a ''drastically'' different physique depending on what he's wearing. Just compare his arms in the [[http://masseffect.wikia.com/wiki/File:Default_Casual_Cargo.png default attire]] to the [[http://masseffect.wikia.com/wiki/File:Default_Casual_Roughneck.png "Roughneck"]] version.
* ''VideoGame/SoulSeries'': When not busy eviscerating anyone on the planet who's come into contact with a particular sword, Ivy Valentine wears a Tudor gown and passes for a noblewoman.
* In the ''Videogame/{{Yakuza}}'' series, characters of seemingly average builds often wear suits that hide incredibly muscular physiques that they only reveal when they [[BattleStrip rip it all off]] for boss battles.

[[folder:Web Comics]]
* In the Lowroad Comics strip ''Giselle'', this is taken to absurdity with the Butler, who's usually a small, scrawny imp, [[http://lowroad75.comicgenesis.com/d/20091129.html revealing a statuesque physique on the beach.]]
* Wren from ''Webcomic/WhiteNoise'' has a thin, lanky build and [[http://www.wncomic.com/archive_comments.php?strip_id=191 looks pretty scrawny]]. [[ArtEvolution In the early strips]] [[http://www.wncomic.com/archive_comments.php?strip_id=6 he looks like]] a full-blown [[NoodlePeople Noodle Person]]. (He's also a long-haired {{Bishonen}}, so he looks [[DudeLooksLikeALady downright girly]].) But when we see him [[http://www.wncomic.com/archive_comments.php?strip_id=195 shirtless]], he's ''ripped''.

[[folder:Western Animation]]
* ''WesternAnimation/TheSimpsons'':
** Ned Flanders, Homer's fundamentally religious Christian neighbor and do-gooder, wears a sweater that hides his [[StupidSexyFlanders comically well-developed body, much to Homer's envy]]. Although "Envy" may not be ''quite'' the name of the deadly sin you're looking for here.
** Groundskeeper Willie's physique looks a bit like Popeye's, with large forearms and an otherwise unexceptional upper body, but whenever he removes his shirt, he's muscled like a [[Franchise/MastersOfTheUniverse He-Man]] doll.
** When the Comic Book Guy starts vandalizing a competing comic book store in a fit of rage, Creator/AlanMoore, Creator/ArtSpiegelman and [[Comicbook/GhostWorld Dan Clowes]] proceed to rip off their shirts and reveal that they have the [[SuperPhysique physiques of superheroes]].
* Parodied in an episode of ''WesternAnimation/SpongeBobSquarePants'', where [=SpongeBob=] and Patrick compete against each other in the Fry Cook Olympics, and they both rip off their shirts to reveal Herculean bodies for a wrestling competition. Patrick had to do this ''twice'' because he was somehow wearing a business suit underneath. This is just for a one-time joke, of course; Patrick is otherwise always shirtless and overweight, while [=SpongeBob=] himself has trouble lifting even a barbell made out of teddy bears.
* The lawyer from ''WesternAnimation/TheMarvelousMisadventuresOfFlapjack'' who takes up Flapjack as an apprentice. Captain K'nuckles challenges him to a boxing fight in order to get Flapjack back, but when he takes off his business suit, not only does he show lots of muscle, but he [[CostumesChangeYourSize grows in height as well]]! (He also puts on a fake mustache to look more like an old-fashioned bodybuilder.)
* One female example is Clara's sister Bleh in ''WesternAnimation/DrawnTogether''. She's severely mentally challenged, wears a helmet and heavy clothing, and appears to have cerebral palsy, but when she puts on a bikini, she looks like a (cross-eyed) Playboy model.
* ''WesternAnimation/AvatarTheLastAirbender'':
** Bumi, the King of Omashu looks like a harmless, hunched-over old man wearing an obnoxiously ornate outfit. But when Aang chooses to challenge him to save his friends, he throws off his robes and reveals a frighteningly ripped old man.
** Iroh, when put into prison, wore a ragged cape covering his body at all times and [[ObfuscatingStupidity acted like he had lost his marbles]] to confuse the warden. In reality, he had been training and preparing for his escape on the day of the black sun, and below his clothes, he was hiding his impressively ripped abs.
* ''WesternAnimation/{{Futurama}}'':
** A variation on this: in the episode "Raging Bender", Bender constantly annoys a taller, lankier robot with an innocent-sounding voice during a showing at the movie theater, causing him to start a fight with him. Trouble is, the robot proceeds to sport several pounds of metal on his body, turning him into his alter-ego: famous robot wrestler "The Masked Unit".
** In "Parasites Lost", [[DoggedNiceGuy Fry]] is infested with alien worms that make him both smarter and more physically fit. When called to defend [[LoveInterest Leela]]'s honor, he rips off his shirt to reveal a nonsensically muscular physique. However, before and after the infestation he looks more like you would expect.
* ''WesternAnimation/{{Metalocalypse}}'' -- childlike Toki is seen to be quite fit, in spite of the dissipated lifestyle he and his bandmates live.
* Incredibly zig-zagged in the WesternAnimation/DaffyDuck vehicle ''Stupor Duck''. His Cluck Trent is Daffy in a suit and hat; his Stupor Duck is Daffy in a Superman outfit with the simple embellishment of shoulder brace that makes him look broad and powerful.
* ''WesternAnimation/MightyMouse'': In the Bakshi series, Mighty Mouse's alter ego of Mike Mouse has all the hero's physical features, all under the guise of a factory worker's uniform and hat. His superhero uniform's sleeves are still visible, so it's a wonder that Pearl hadn't caught on by then.
* Marquess from ''WesternAnimation/MikeTysonMysteries'' is a foppish ghost who looks like he'd be scrawny, but is totally ripped under his 19th-century clothes.

[[folder:Real Life]]
* Actor/comedian Chris Elliott has made a career out of playing [[HollywoodHomely semi-unattractive]] pathetic losers who, at best, end up as the comic relief sidekick and at worst are the constant [[ButtMonkey target of abuse from everyone around them]]. In these roles he wears a lot of baggy sweatshirts and other loose clothing out of necessity. Turns out that Elliot, among other things, is a RealLife weightlifting fanatic and has a body that looks like it's made out of cast iron.
* The physical demands of acting in general means many actors are often more physically fit than they might appear.
* Catch a professional or amateur fighter from the lighter weight classes, a cop or federal agent, a member of the armed services, a college or pro athlete, or a seasoned martial artist in their street clothes and there's a good chance you'll see this trope in action.
* An extreme example is mixed martial artist Roxanne Modeferri, who looks like a nice, nerdy girl and certainly comes off as one when [[OneOfUs she quotes the Jedi Code and cites the Power Rangers as her inspiration]]. She's one of the top ju-jitsu artists in the world, and if pitted against most men, she'd tear their arms off and walk away with them.
* Craig Walsh-Wrightson, the guy who played Solonius in ''Series/SpartacusBloodAndSand'', surprised everybody in the studio when he removed his shirt and revealed his well-chiseled physique.
* A frequent example of such an outfit: The men's business suit (collared shirt, jacket, tie) was and is specifically designed to disguise a multitude of sins, and as such, also disguises a multitude of virtues (the three piece suit, which adds a vest, goes even further in both).