[[quoteright:275:[[{{Disney/Cinderella}} http://static.tvtropes.org/pmwiki/pub/images/cinderella_glass_slipper_fitting.jpg]]]]
[[caption-width-right:275:[-Looks like you have your future {{Princess}}.-] ]]

->'''Grand Duke:''' The Prince, Sire, [[ThePromise swears]] he'll marry none but [[TropeNamer the girl who fits this slipper]].\\
'''King:''' He said ''that'', did he? Ha ha, we've got him!\\
'''Grand Duke:''' But, Sire, [[SuspectIsHatless this slipper may fit any number of girls]].\\
'''King:''' That's his problem. [[IGaveMyWord He's given his word]], [[ExactWords we'll hold him to it]].
-->-- ''{{Disney/Cinderella}}''

In fiction, some key pieces of clothing can only be worn by certain people. Shoes are a common choice, but other clothing will do. Thus if it fits someone, it can be used to ID them. Sometimes this can work in RealLife, but it's usually not enough evidence on its own. It might help if it's an accessory such as a dental plate or prosthesis that is custom-made to fit one specific individual's body.

Note it only counts when it's wearing it, not [[LoyalPhlebotinum using it]], or even touching it.

Compare IdentificationByDentalRecords. May overlap with ClothesMakeTheSuperman, if the clothes bestow special abilities but [[LoyalPhlebotinum will not work for just anyone]].

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!!Examples

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[[folder:Anime & Manga]]
* Parodied in the ''Manga/RanmaOneHalf'' manga by a story arc titled "Cinderella's Favor" in which a guy has gathered girls to his private island and asks them to step on his head, so he can compare their feet and find [[LoveAtFirstPunch the girl who stomped on his head a long time ago]] (which, of course, is actually [[GenderBender Ranma]]).
* ''Anime/BattleOfThePlanets'': Princess once lost one of her boots during a battle and the enemies try to use it to find her.
* ''LightNovel/OokamiSan'' : The first episode features a tennis player contemplating retirement trying to find the girl who fits the sneaker that kicked him in the face. [[spoiler: He does, and is revealed to be a bit of a pervert and only did so to determine that said girl had great control of her body to do so. They end up going out.]]
* Averted in ''Anime/YesPrettyCure5'', after the main characters come back from Cinderella's world, Milk (a bunny fairy mascot) jumps with her whole body in the shoe, preventing that Nozomi, who was Cinderella in that world, could try to wear the glass shoe, despite it's actually Nozomi's. Of course, Nozomi who wants to marry her prince (Coco) isn't amused.
** Despite that the main characters know the story, Nozomi being a {{Dojikko}} really lost her shoe by tripping downstairs.
** This trope is played in ''Anime/SmilePrettyCure'', where the Cinderella scenario happens again, but the villains try to ruin the story because their goal is creating bad ends. Miyuki being GenreSavvy takes off her shoe and puts it on the stairs instead of losing the shoe. But the villains being DangerouslyGenreSavvy steal the original shoe and they make an extra large glass shoe for Akaoni. His shoe fits, but it immediately breaks. Candy takes the original back and the shoe flies on Miyuki's foot who just [[{{Dojikko}} tripped]].
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[[folder:Comic Books]]
* The wish ring in ''LittleEgo'', which will only work for the person who manages to slip it on. Naturally this person turns out to be Ego. And it doesn't go on her finger...
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[[folder:Fairy Tales]]
* ''{{Literature/Cinderella}}'' and its variants are among the best known; some use a ring or other article rather than a slipper.
* In ''[[http://www.sacred-texts.com/neu/celt/pt1/pt118.htm The King Who Wished to Marry His Own Daughter]]'' and several others of the type, the dying queen gets a promise to never marry a woman who can not wear an article of her clothing. [[{{Squick}} It turns out that their daughter is the only one who can.]]
* In ''{{Literature/Donkeyskin}}'', the [[KingIncognito Princess Incognito]] drops a ring inside a cake she bakes for the prince who then calls for all women in the kingdom to come and try on the ring.
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[[folder:Fan Works]]
* Several ''Literature/HarryPotter'' fanfics have each pureblood family having a ring that automatically resizes itself to fit whoever becomes head of that family.
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[[folder:Films -- Animation]]
* Disney's ''{{Disney/Cinderella}}'', the TropeNamer, acknowledges the potential absurdity of the trope: the Grand Duke protests that the slipper could fit any number of girls, to which the King replies that he doesn't care, he's holding the prince to his ExactWords in order to ensure he gets married. The trope is also ultimately subverted, as Cinderella doesn't even manage to try on the slipper before it's smashed... but she is able to produce its match, which serves as even better proof of her identity. This references an often-omitted part of the Charles Perrault fairy tale, in which after Cinderella fits her foot into the slipper, she pulls out the match and puts it on her other foot.
* In ''Disney/CinderellaIIIATwistInTime'', Prince Charming ''himself'' acknowledges the flimsiness of a shoe size as proof of one's identity, but also points out they don't have any other means of finding Cinderella. His and the king's doubts about this plan become confirmed when Lady Tremaine uses [[ItMakesSenseInContext a stolen magic wand]] to make the glass slipper fit stepsister Anastasia instead.
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[[folder:Films -- Live-Action]]
* Subverted in ''Film/StarTrekVITheUndiscoveredCountry''. The boots of one of the assassins are found, but in the locker of a crewman with webbed feet, and the boots are for humans. [[DefiedTrope They were obviously planted to avoid this trope]]. Chekov even mentions the aphorism from the "[[CulturalPosturing old Russian fairy tale]]" - ''"If shoe fits, wear it."'' He notably fails to look down to make sure that the boots might indeed fit the person he's accusing.
* Used as contributing evidence in ''Film/InglouriousBasterds''.
* At the end of ''{{Enchanted}}''.
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[[folder:Literature]]
* Book 4 of ''Literature/TheFaerieQueene'': The winner of the BeautyContest will be the one who can wear the [[NotQuiteDead (supposedly) dead]] Florimell's golden girdle, as it can only be worn by a {{virgin|power}}, and virginity is beautiful. At least, those were the rules, but when the belt fits none of the girls except Amoret, the judges stubbornly award it to who they think is the most attractive girl anyway (who is actually a clone of the real Florimell), chaste or not, despite the protests of Amoret's KnightInShiningArmor, who is actually a SweetPollyOliver. Yes, it's an interesting story.
* In ''Literature/ChroniclesOfTheKencyrath'', the Kenthiar is a collar that only the Highlord can wear -- everyone else who touches the inner surface will lose their fingers, or worse.
* In Creator/DianaWynneJones's ''[[Literature/TheDalemarkQuartet The Crown of Dalemark]]'', Mitt is [[spoiler:descended from the Adon and destined to become King, and the ring that marks him out as such actually grows and shrinks in order to fit him perfectly on any finger he puts it on. He doesn't realise, because the ring gets swapped with a nonmagical copy.]]
* ''Discworld/WitchesAbroad'' utterly dismantles this trope. Lilith is trying to {{invoke|d trope}} the trope for the Cinderella story she's masterminding, and Nanny Ogg and Granny Weatherwax point out that a lot of feet can fit a shoe that size with enough socks... and even if you don't have socks, there must be a ''lot'' of [[SuspectIsHatless people with that shoe size in the city]]. The only way to use it as a test is if you know who dropped it in the first place....
** Nanny Ogg ''is'' one of the women the shoe fits. And she actually pretends to consider marrying the Duc, even though she knows he's [[spoiler: a frog]]. Easily one of the [[Funny/{{Discworld}} funniest parts]] in the whole book.
* Used in MercedesLackey's remake of ''Cinderella'', ''[[Literature/ElementalMasters Phoenix and Ashes]]''. Cinderella's wicked stepmother chopped off her pinky finger in the first chapter, so when she leaves her gloves behind at the masquerade ball, there's no question about who they belong to. Doesn't stop her wicked stepsister from trying, though, and coming out to the hero to claim her gloves still loopy from the painkillers.
* Justified in ''Literature/EllaEnchanted'': There's fairy blood in Ella's family, so her feet are significantly smaller than most people's.
* In ''Bound'' by Donna Jo Napoli, a Chinese ''{{Literature/Cinderella}}'' story, it was justified because the shoe was designed for unbound feet, like main character Xing Xing who grew up without binding her feet.
* Justified in ''Princess of Glass'': the slipper was molded to the exact shape of the girl's foot. And the slipper isn't the real test anyway -- the test is whether the prince can pick out the girl he really loves even with his mind clouded by magic.
* One mystery short story had a detective telling a suspect that a killer had left a print behind in blood at the scene of the murder, but it was the print of a glove. The suspect pointed out that would not help identify the killer. The detective said the glove had a distinctive characteristic that would identify the killer exactly and asked the suspect to show him his hands. It turns out, the glove [[spoiler:was made for someone with six fingers]].
* Roald Dahl's take on ''Cinderella'' in ''Revolting Rhymes'' has one of the stepsisters switch the slipper with one of her own. When it fits, the prince responds by [[OffWithHisHead chopping her head off]]. And then [[AxCrazy does the same to the other stepsister]] before she can even try. Cindy is naturally horrified, and decides she wants nothing to do with this psychopath.
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[[folder:Live-Action TV]]
* Jim Henson's ''Series/TheStoryteller'' plays with this trope in the episode "Sapsorrow". First there's a ring handed down through the generations of the royal family; in order to choose a wife, the king must find a woman who fits the ring, and by the same token if the ring turns out to fit a woman, the king must marry her... even if she's his own daughter, demonstrating one of the problems with relying on the fit of a piece of jewelry to choose your wife for you. Later on, the eponymous princess leaves her slipper behind at a ball, Cinderella-style, and the prince makes the standard proclamation that he will marry the girl whose foot fits the slipper - which nearly backfires on him when Sapsorrow's fat, ugly, bad-tempered sister manages to cram her foot into it.
** An early Muppets special, ''Hey, Cinderella'', has a subversion similar to the Disney version. Here, the prince accidentally steps on the glass slipper, making finding the wearer highly unlikely. The king, however, reasons that while there may be a maiden out there with a pair of glass slippers, the right maiden would be the one who has only ''one'' glass slipper.
* ''MightyMorphinPowerRangers'': Several episodes had [[ThoseTwoGuys Bulk and Skull]] trying to learn the identities of the Power Rangers. In one episode, Bulk took inspiration from "Literature/{{Cinderella}}" and decided to make imprints of the Rangers' boots. An opportunity presented itself when Lord Zedd's MonsterOfTheWeek in that episode had the Rangers battle illusions of past monsters at the beach. At the end of the episode, Bulk and Skull went to Ernie's juice bar with a cement block with imprints of all five Rangers' boots. One of the rangers turned the music on so the musicians would make Bulk drop the block. While he managed to keep holding the block despite the dancers, he was caught unprepared for Skull's congratulatory tap on the back.
* In the ''Series/DoctorWho'' episode "The Beast Below", Liz 10 (Elizabeth X, queen of a future Britain) has a royal mask moulded to the exact shape of her face. This leads to the discovery that [[spoiler:she has been ruling for centuries, not for ten years as she believed - her memories are erased every ten years to keep her from remembering the Star Whale.]]
* Parodied in ''Series/TheGoodies'' episode "Punky Business". Graeme turns Tim into a punk by cutting his leg off. After re-attaching it, he warns Tim that the catch won't last much past midnight. Tim goes to the Trendsetter's Ball, where he loses his leg at midnight. Caroline Kook vows to marry the man whom the leg fits. Cue punks cutting off their own legs.
* Subverted on ''Series/TheFreshPrinceOfBelAir''. Will finds a last-minute date to a Halloween party in a kind waitress named Cindy, who just happened to dress as Cinderella. At midnight, she flees and drops her shoe and Will thinks he's been "touched by magic"... but then Cindy comes back to claim her shoe and gives Will her phone number.
* In ''{{Series/Mash}}'', BJ is accused by a general of throwing a party in the hotel he was staying at, which leads to the general being caught in an embarrassing situation; but BJ insists he was back at camp at the time, and that the real culprit was likely a friend of his who is a notorious practical joker. The general's main piece of evidence is a hat left in the hotel room, and has BJ put it on. It is obviously ''not'' BJ's hat.
* An episode of ''Series/{{Whitechapel}}'' has the investigative team track a witness by the shoes she left behind in a graveyard (having kicked them off to better out-run her would-be attacker).
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[[folder:Newspaper Comics]]
* One of Jon's dates in ''ComicStrip/{{Garfield}}'' ran out of the restaurant at midnight, leaving behind one of her ''steel-toed work boots''. Garfield suggests going to the foundry to see who it fits.
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[[folder:Web Comics]]
* DeconstructedTrope in ''Webcomic/GirlGenius'' during the [[http://www.girlgeniusonline.com/comic.php?date=20090107 Cinderella parody]]. Tarvek has Cinderella's slippers and wants to find the girl who fits them, but Gil argues that the shoes, size nine-and-a-half, would fit too many other women. While trying to narrow it down Tarvek brings out a picture of Cinderella, and Gil points out that if they have that they no longer need the shoe.
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[[folder:Western Animation]]
* {{Defied}} in ''WesternAnimation/MyLittlePonyFriendshipIsMagic''. Near the end of "The Best Night Ever", the ponies are running away from the chaos they accidentally caused at the Grand Galloping Gala. Rarity drops a glass slipper, and Pinkie Pie tells her, "Now your prince is sure to find you!" Rarity, who has no interest in meeting [[PrinceCharmless Prince Blue Blood]] ever again, screams and crushes the slipper into shards.
* An... interesting variation occurred in ''WesternAnimation/RockosModernLife'' once: When Rocko accidentally mooned a newspaper camera during a movie premiere, a fashion designer saw the picture, and decided the owner of the posterior would make a perfect underwear model. To find the potential model, all of the men in O-Town took turns sitting in an imprint made of Rocko's bottom in the cement that night.
* ''LolaAndVirginia'': While wearing a yogurt costume, Lola met a celebrity boy. As she left, she lost her glasses and the boy uses them as a clue to find her. Being interested on the boy, Virginia gets her own yogurt costume but Lola proves the truth by being the one who can see while wearing the glasses.
* In the ''BobsBurgers'' episode "Lindapendant Woman" Tina meets a boy at the supermarket, but since she couldn't see his face through the shelves between them all she has to identify him is the band-aid that dropped off his finger.
* In ''"WesternAnimation/RocketPower"'' After sneaking into the skate park to see the new ramp, Twister accidentally slips in the wet cement, leaving an imprint of his head and hand. Determined to find the culprit, the owner overhears Sam sarcastically suggesting they do what Cinderella did and find out whose head matches the shape in the cement. He then lines up the skaters and lets those who don't fit cement imprint into the park.
* In the "Scarecrowella" episode of ''WesternAnimation/MagicAdventuresOfMumfie'', Bristle comes to Mumfie's house to give back a hat left at the ball, which they find out fits Scarecrow the best. Then Bristle says he has to marry The Queen of Night. Scarecrow likes this idea [[spoiler: until he is told that he can't visit Mumfie and Pinkey, go on adventures, or scare crows.]]
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