%% Image format kept as is per Image Pickin' thread: http://tvtropes.org/pmwiki/posts.php?discussion=1310559261018532300
%% Please do not change or remove without starting a new thread.
%%
[[Film/{{Superman}} http://static.tvtropes.org/pmwiki/pub/images/Clark_Kent.jpg]] [[quoteright:200:[[Film/{{Superman}} http://static.tvtropes.org/pmwiki/pub/images/reeve_superman2_9974.jpg]]]]
[[caption-width:200:[[MuggingTheMonster Yeah, you could probably take this guy in a fight...]]]]
[[caption-width-right:200:[[Comicbook/{{Superman}} Or... maybe not.]]]]

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 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) that couldn't possibly have fit inside the outfit they were wearing beforehand. This can be PlayedForLaughs.

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

----
!!Examples:

[[foldercontrol]]

[[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 has a powerfully muscled body.
* ''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}}'' has Master Roshi, a scrawny little hunchbacked pervert who almost ''doubles'' in height, shoulder width and muscle mass when he first takes off his shirt.
** For an in-universe example, Gohan's high-school outfit almost looks like it's a size too large, undoubtedly to help hide the fact that he's built like a... well, [[ShapedLikeItself 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 ''DarkerThanBlack'', this is done by Kirihara's new boss, who looks like {{Golgo13}} 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 ''{{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.
* In ''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 ''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 ''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 ''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}}'': Hinata Hyuga's uniform is more about shyness than a secret identity, but her bulky jacket and loose pants are definitely designed to 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.
* [[Manga/AttackOnTitan Mikasa Ackerman]] looks pretty scrawny even in the rather form-fitting uniform, not to mention the baggy civvies she usually wears, but boy, is she ''[[AmazonianBeauty ripped]]'' under them.
** Annie is just as ripped under her uniform. She rather unconvincingly portrays herself as a WeakButSkilled girl. Eren knows all too well how strong she is since most of their hand-to-hand sparring ends with her slamming him into the ground.
* 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.
[[/folder]]

[[folder:Comic Books]]
* Comicbook/{{Superman}} offers the TropeNamer, as his alter ego, Clark Kent, was 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.
** Possibly the greatest success of [[Film/{{Superman}} 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.
** In ''Birthright'' 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.
* [[{{Spider-Man}} Peter Parker]] is a less emphasized example, but few would guess that his regular clothes hide a sinewy physique.
** Back when SteveDitko was still drawing ''Amazing Spider-Man'', his costume did the same thing.
** There was an issue of Spectacular Spider-Man where a private detective had deduced who Spider-Man was, and suggested 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 deduced that ''Jameson'' was Spider-Man. Jameson was most likely not amused]].
** In ''Ultimate Spider-Man'', 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]]

[[folder:Fan Fiction]]
* 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]].
[[/folder]]

[[folder:Films -- Live-Action]]
* One of the best examples comes from the 1985 Creator/JackieChan / SammoHung action comedy ''My Lucky Stars''. 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 tended 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 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 an weak old magician can hide a full fishtank. 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 PeterDavid's novelization of ''[[Film/{{Spider-Man}} Spider-Man 2]]'', 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".
* ''IchiTheKiller'': Jiji, the little old chessmaster, wears baggy clothing throughout the film. At the very end, his strips to his underwear to reveal a ridiculously muscled body.
[[/folder]]

[[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 over sized Hawaiian shirts. Then he joins the swim team. Even Cordelia looks interested.
* Nerdy Billy Cranston from MightyMorphinPowerRangers was often seen wearing baggy overalls and shirts that were a size or two too big. This was to hide the fact that his actor, David Yost, was a professional gymnast and built like a plow horse.
* 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.
* Crispin Glover as he [[http://www.youtube.com/watch?v=ALapHYNSmoA infamously appeared on]] ''The David Letterman Show'' 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 fiancÚ from the first season of ''TheLWord'' was like this. Any scene where he took his shirt off was 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 wore baggy shirts for the first few seasons of the series and fit the stereotypical nerd profile, but later on he TookALevelInBadass and got to show off some impressive biceps.
* Jimmy Palmer from ''Series/{{NCIS}}'' was revealed in season 9 to have a great set of abs. To Abbs, 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 ''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.
[[/folder]]

[[folder:Literature]]
* Belgarath from the David Eddings series 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.
[[/folder]]

[[folder:Webcomics]]
* Taken to absurdity in [[http://lowroad75.comicgenesis.com/d/20091129.html this]] Lowroad Comics strip.
* 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]]

[[folder:Western Animation]]
* ''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]].
*** "Envy" may not be ''quite'' the name of the deadly sin you were 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.
* Parodied in an episode of ''{{SpongeBob SquarePants}}'', 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. 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 ''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 grows in height as well!
* One female example is Clara's sister Bleh in ''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.
* Bumi, the King of Omashu from ''WesternAnimation/AvatarTheLastAirbender'' 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.
* ''{{Futurama}}'' has a variation of 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.
* ''{{Metalocalypse}}'' -- childlike Toki is seen to be quite fit, in spite of the dissipated lifestyle he and his bandmates live.
[[/folder]]

[[folder:Videogames]]
* ''VideoGame/MassEffect2'' gives 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.
* When not busy eviscerating anyone on the planet who's come into contact with a particular sword, [[SoulSeries Ivy Valentine]] wears a Tudor gown and passes for a noblewoman.
[[/folder]]

[[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.
[[/folder]]

----