Wonder Girl: You're not a villain. Arrowette: I am. And it's gonna stink. I'm not going to get to win anymore. All my friends will hate me. Oh God... I'll have to get a tight, skimpy black leather outfit that shows off my cleavage. Oh God... I'll have to get cleavage.
The most dramatic way to show that the protagonist has gone to The Dark Side is to give him or her a new costume. This outfit's coolness is sometimes inversely proportional to the coolness of the original, but is just as often much cooler, more flattering, and (for females) sexier as it bares more skin and curves, with a new hairdo and costume colors to complete their Evil Makeover and look. A character who returns to the side of good usually ditches the entire costume.
Sometimes, a character will split into a Good Twin and an Evil Twin, with the latter wearing one of these costumes. If so, the Good Twin will often wear a more "good" version of the costume, with lots of white and, usually, gold. And, of course, if the character already wears dark colors, the switch is often to a creepy, funeral/ghost style of white.
This trope is arguably most prevalent among Superheroes, where outfits are iconic.
Why does this costume almost always look better than the hero's original? Why, that's because Evil Is Cool (either that, or because it was designed second).
If the newly evil look is entirely spontaneous, requiring no shopping of new clothes for the character, then it is the sub-trope Paint It Black.
Often overlaps with Evil Wears Black (as in the new costume will be that color). Sometimes overlaps with Sensible Heroes, Skimpy Villains (as in the new costume will be skimpier).
Compare Adaptive Armor.
Contrast Good Costume Switch.
Not to be confused with an Evil Twin dressing as his/her good twin.
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Anime & Manga
In the Galaxy Angel Beta manga based on Galaxy Angel Moonlit Lovers, instead of simply being mistaken for evil as she was in the game, Chitose actually goes evil, changing not only her costume, but the paint job on her ship.
Male (insert joke here) example from Get Backers: when Kazuki is Brainwashed and Crazy, he trades his over-sized androgynous t-shirts for a form-fitting black tank top with a cross like design. Amusingly, his shirt starts out tucked into his jeans, but ends up baring his midriff by the time the final battle rolls around. Also averted later on: when Juubei, Toshiki, and Sakura are Brainwashed and Crazy, they are given white uniforms—although Sakura's does show her cleavage.
Mermaid Melody Pichi Pichi Pitch had Sara, who, besides exchanging her orange frilled dress for a black diva outfit (in the manga; in the anime, she just wore her "civilian" clothes all the time), also changed her hair colour. This form, actually the first form in which we see her, is fanonicallydubbed Black Sara.
The anime version of Pretear had Sasame changing his simple outfit for an incredibly elaborate black and purple one, complete with a demon larva logo, after he joined the Princess of Disaster. Both of them revert to normal at the end, though.
In Sailor Moon, Tuxedo Mask's much cooler "Prince Endymion" armor is first seen out of flashback when he is captured and brainwashed by the Dark Kingdom.
Sailor Mercury gets a costume upgrade when she becomes Dark Mercury in Pretty Guardian Sailor Moon. Her Transformation Sequence also improves, although that's more likely a case of the special effects crew honing their skills as the series progressed.
Little Chibi-Usa/Rini, whose face-heel turn involved transforming from a cute little girl into a twenty-something seductress in a slinky black dress. Apparently, evil isn't only cooler; it's also sexier. More, she even tries to seduce her own father.
Only in the manga. In the anime, she hates him and her mom and tries to kill them both. The enemy still tries to brainwash her mom from the future with similar imagery, but they fail.
A villain from the first season of Slayers suffered a full-body burn at the hands of Lina Inverse. He never bothers to remove the bandages (which make him look like a Mummy) until after his Heel-Face Turn.
What's more, an evil priestess who wears a full-on black-leather-with-cleavage-and-spikes ensemble is shown in flashbacks wearing a white robe. Why she made the change, since she never admits to being evil, is uncertain.
During the Yu-Gi-Oh! Battle City story arc, immediately after Malik's subconscious dark side takes over and he becomes even more villainous than before, in the very next scene, only minutes later, he has traded his lilac vest and black pants for a black shirt, beige pants and a purple cape.
In the second season of Yu-Gi-Oh! GX, the bad guy's team's color is white because of the religious overtones of his cause of destroying the world and rebuilding paradise, and all the brainwashed members of his cult wear white. In the episode when his first convert returns to normal, Jun swaps the white trenchcoat for his traditional black one — and his normal outfit underneath inexplicably reappears along with it. In addition, Kaiser Ryo dons a black trenchcoat after his Freak Out and Judai wears a black full-body armor after being taken over by his Super-Powered Evil Side. And under Yubel's possession, Johan wears a sleeveless outfit that otherwise resembles bondage gear, cranking up the Ho Yay with Judai to even more ridiculous levels.
A popular trend in Yu-Gi-Oh! 5Ds, as performed by both Carly, after coming back after being killed by being thrown off a building, and Misty, wanting revenge against Aki/Akiza for killing her brother, each gaining new black outfits, black colored eyes, and facial markings.
Sherry gets a new black and white outfit after she becomes allies with Zone, but since it shares many similarities with her old outfit, this troper didn't even notice until someone pointed it out to her...
III Arclight from Yu-Gi-Oh! ZeXal. During Episode 47, the middle of a mini-arc and his duel with Yuma Tsukumo, he gains gladiator-type armor, complete with cape and helmet and everything. Definitely marked that he was getting serious, considering that right after, he took away Yuma's 'kattngu', essentially making him lose all self-confidence and will to win. Not even mentioning how in Episode 48, he killed Astral, Yuma's best friend. While he did help revive him in Episode 49... It marked a serious change from III's normal personality.
This trope sort of shows up in the Ah! My Goddess! movie, when Keiichi is possessed by Belldandy's old mentor, Celestine. However, although the resultant flowing robes and markings are cooler, he also looks...significantly more righteous and 'good', with the evil only actually being visually hinted at by possessed-Keichi's facial expressions at times.
Shows up better in the Lord of Terror arc; whenever the LoT Body Surfs to someone else, they get an Evil Costume Switch. Egregious in Keichi's case, because the evil costume literally materializes out of thin air.
Not only that, he even grows his hair out and dyes it blond in a matter of seconds! The latter of which (dying it blond) only appears in the manga, though. In the anime, his hair is still black when it grows, but unlike the manga, mysteriously goes back to being short after the Lord of Terror is defeated and removed from Keiichi, although the costume still remains on Keiichi (cue his shocked remark at it in the manga).
The Angel Eater arc is also a great example: Belldandy, while implanted with the devil by Hild, gains a tight and revealing outfit and demon wings.
In Princess Tutu, when Mytho's heart is poisoned with Raven's blood, he gains a new costume that is all black with raven feathers. Rue's outfit as Princess Krahe might also count, although it is more a case of Dark Magical Girl.
In Berserk, upon making his Face-Heel Turn by making a Deal with the Devil to become the fifth member of the Godhand, Femto, Griffith's outfit is a darker, more sinister and skin-tight version of the warrior armor that he wore with the original Band of the Hawk. Then he decides to get what he wants and uses less obvious clothing, reminiscent of his old armor, while becoming a Villain with Good Publicity.
When Shizuru had her Face-Heel Turn late in Mai-HiME, she stopped wearing her standard-issue school uniform for a short while and swapped it out for a dark purple kimono. She is seen wearing it again in her last fight with Natsuki.
Tomoe gets this treatment in Mai-Otome with her old Robe replaced with a suit of black plate armor.
Nina's Transformation Sequence after her Face-Heel Turn gave her a black silhouette instead of a blue one. There were a few times when she didn't activate it on her own. Other than that, she wore basically the same uniform as before, only darker.
In Naruto, when Sasuke is inspired to do a Face-Heel Turn, he is wearing a different, black one-piece suit. This is compounded after the time skip, when he starts dressing like a gaypirate.
When Cellaria in Soul Link reveals her true intentions as The Mole, she spends the rest of the series wearing a black, very stripperiffic costume that stands in sharp contrast to the green military uniform she was wearing before. She also lets her hair down and crushes her glasses, apparently taking a page from the book of Bleach's Aizen.
During the Kodoku arc of Fushigi Yuugi, Tamahome wears a sophisticated black suit to match his nun-chucks, complete with a blue bandanna and belt to replace his red belt, as well as a red earring that, apparently, helped with brainwashing.
When Roll is infected with a virus in Mega Man Battle Network to turn her evil, she gains fangs, a whip, and six inch heels, in addition to becoming more...shapely. Um...she's, like, twelve...
Aizen and Gin get new outfits as well, as does Orihime after Aizen forces her to make a truly Sadistic Choice.
Also inverted in Bleach, where good guy Ichigo wears black, and his inner hollow has a white version of Ichigo's clothes and even a white sword.
When Uryuu joins the Vandenreich, he gets their classic uniform. That has almost no difference to his old costume theme. Now he wears a Badass Long Robe and looks like a soldier. It sympolizes that he has lost his individuality.
Katsumi Liqueur of Silent Mobius obtains a black cloak and tight leather clothes when possessed by the demonic sword Medium.
Justin Law in Soul Eater. The crosses on his priest's robes get replaced by the three eyes of the Kishin. Kid gets a minor version of this following his...encounter in the Book of Eibon: his black and white colour scheme stays, but his suit's all black except for white stripes and a cravat (?).
In Fullmetal Alchemist, Ling switches his brightly colored Xingese clothes out for an all-black ensemble with a Badass Longcoat upon accepting a Philosopher's stone from Father and becoming Greed.
Subverted, kinda. While he sticks with this ensemble for the remainder of the series, it kind of loses the evil part after Greed pulls a Heel-Face Turn.
In episodes 21-23 of Tiger & Bunny, we see that both the fake Wild Tiger and Barnaby (though, in his case, it's symbolic of antagonism towards Kotetsu, not 'evil') are sporting black versions of their suits. Barnaby goes back to his usual suit halfway through ep. 23, after regaining his memories and siding with Kotetsu once more.
Shakugan no Shana, Snake of the Festival Sakai Yuuji. He even gets a new hairdo aside from a black armor.
In Queen's Blade Rebellion, several members of the old cast get costume switches, but Elina's and Ymir's especially reflect their change from being on the side of the "good guys" to being on the side of the "bad guys". Goodbye tiger-striped amazoness costume with blue bra-armor for Elina, goodbye pink and white doll dress for Ymir, hello black leather with metal protrudings and red and grey off colors. Claudette also switches out her amazon costume in favor of a regal Woman in White getup.
In the original anime, Listy gets this in a big way when she is brainwashed by Aldra. She goes from a revealing but still rough-around-the-edges brown leather outfit with a tousled hairdo to a silky black jumpsuit sporting Absolute Cleavage and slick, straightened hair worn long. Aldra herself goes through this in reverse between the first series and rebellion, going from an outfit that's all intimidating sharp edges to the garb of a housewife.
Transformers Armada features Wheeljack (no relation to the more famous Transformer with the same name). Originally a white Autobot, he performed a Face-Heel Turn and joined the Decepticons, and the next time he was seen, he'd started "wearing" a black sports car as his alternate mode.
Neon Genesis Evangelion contains a subtle male example. After Yui "dies," Gendo switches from his white lab-coat and '80s-style prescription glasses to a dark blue (almost black) military jacket and orange sunglasses.
Rei usually wears a white plugsuit, but in Rebuild of Evangelion, Seele's new Rei clone wears a black one. Shinji also trades in his classic blue and white plugsuit for a black variant after betraying Misato and siding with his father.
Evangelion Unit 13 starts off with purple and green coloring, but the color scheme changes to white and red during Instrumentality.
In HeartCatch Pretty Cure!, all Desert Apostles except Dune and Dark Precure got a new costume when they joined... the Desert Apostles.
Perhaps the most memorable and well-known example is Spider-Man's black costume. When Peter first found it during the Secret Wars, it just gave him unlimited web shooters. He discovered that it was the cause of his fatigue, taking his body out at night while he was sleeping. Reed Richards figured out that the suit was alive and trying to bond with him. His rejection hurt it and it tried to fight back. After he got rid of it, it found Eddie Brock, turning him into Venom and giving them both the means to fight Spider-Man. In a way, Spider-Man's black costume is a reverse switch: the costume turned him evil (or just amplified his aggression to feed off his adrenaline, depending on the explanation).note The evil side of the suit and everything that came with it was actually caused by a Retcon. Fans grew tired of the black suit and wanted Spider-Man's iconic red and blue back and the writers needed a justification for him to get rid of it.
Ai Apaec, the impostor Spider-Man from the Dark Avengers, wears a black Spidey outfit inspired by the original symbiote costume.
After being branded as terrorists and fugitives in the aftermath of AVX, Cyclops and Emma Frost have started wearing black costumes.
The Marvel comic New Mutants has a cover depicting the team as evil/good variations. In a time-slipped story, two NMs see the others as future villains possessed by Amahl Farouk or members of the Hellfire Club. Basically, 1980s colored punk hairstyles, leather and denim cut-offs, chains, tattoos, and smoking. However, when girl-werewolf Wolfsbane reverts to her human shape, she is wearing a rather nice green evening gown.
A partial occasion of this is Rose and Thorn, a DC Comics character with a dual personality. Rose wore modest outfits, and her alter ego, Thorn, if not evil, was definitely more mischievous and dark. She, of course, wore the quasi-Stripperiffic outfit.
At one point, Susan Storm of the Fantastic Four was Brainwashed and Crazy, courtesy of Psycho-man and Hate-Monger, which prompted her to start calling herself Malice, Mistress of Hate, use her force-field powers in new and unpleasant ways, and walk around in a black leather dominatrix outfit covered in spikes.
This was also an episode of the animated series. She mopped the floor with the three members pretty easily, too.
During the Dork Age, when the Fantastic Four were made to be Darker and Edgier, she wore a stripperiffic costume complete with a Cleavage Window and a bare mid-driff as a way to show how much grittier she had become. This was given a shift Retcon, explaining that it was the evil Malice personality trying to come back via her subconscious. Thankfully, she went back to a more modest look.
A notorious example is Phoenix's switch to Dark Phoenix in X-Men, which was marked by her green costume turning red. (Otherwise, it looked exactly the same; Dark Phoenix is so evil that she does not need to be Stripperiffic!) When a later host of the Phoenix showed up in the red costume, her teammates were immediately alarmed; she explained that she just didn't like green. There are subtler changes in the Phoenix's costume that have been ignored in later Phoenix stories: when she first gets her powers, the phoenix symbol on the costume's black neckpiece is small, about the size of the phoenix symbol that nowadays appears over Rachel's eye when she uses her powers. By the time she starts acting Anti-Hero-ish and being unapologetic about it, the phoenix symbol fills the neckpiece. When Wyngarde's More than Mind Control pushes her over the edge and the red suit debuts, the neckpiece is gone, the phoenix symbol now being so large that it covers her torso. Later artists forget, and the good Phoenix's chest symbol always fills the neckpiece.
The current Supergirl, Kara Zor-El, was hit with black kryptonite in Supergirl #3, causing an evil duplicate to suddenly emerge from her body. Said evil clone materialized from her body already wearing a black costume. Apparently, evil kryptonite clones have black clothing as part of their very nature. This trope was also lampshaded an issue later, when evil Supergirl switched her costume with the original's at superspeed, in an attempt to fool Batman and Superman as to who was the evil clone.
This was based on an old Silver Age story in which red kryptonite created Satan Girl, who likewise wore a black outfit. Her version had a cowl and no S-symbol, because her identity was originally a mystery.
The Matrix-Supergirl was a shapeshifter, who would periodically go Brainwashed and Crazy or just plain crazy and shift her costume into something sleeveless with spiked bands around her arms.
Rare example of a male character going Stripperiffic: during the X-Men event Inferno, Madelyne Pryor, having just undergone a Face-Heel Turn (into her own Stripperiffic costume) and now calling herself The Goblin Queen, brainwashed Havok into becoming her Goblin Prince. His duties included wearing this costume◊. According to X-writers at the time, this particular ensemble was supposed to symbolize the evil in his soul. Although it appears to be the costume that shows off the Ho Yay in his soul. Basically it was made by throwing razor-sharp glass at his normal costume until it looked suitably evil. Madelyne shouldn't have bothered.
While not specifically an evil costume change, Speedball post-Civil War dropped his bright orange, yellow, and blue spandex in favor of a new name, "Penance" (dubbed "Bleedball" by fans), and an accompanying outfit that was black and red with metal armor and spikes. LOTS of spikes. On the INSIDE. Which served a dual purpose: he needs to feel pain in order to activate his incredibly destructive powers, and when he found the guy who really blew up Stamford, he put the costume on him.
During his fake Face-Heel Turn, he wore a red and black costume instead of his typical blue and black one. No one was fooled for a second.
And an evil future Nightwing, called Deathwing, has a costume that includes shoulder spikes, a plunging neckline, and a nipple ring.
The red and black is coming back for the reboot. Fans are not happy, citing that he either looks like his evil self, or Terry from Batman Beyond...also, the red lenses in his mask make him look even more evil. What happened to Dick being the kid Bruce "got right"?
In the Star Wars Expanded Universe comics taking place after the movies, Luke Skywalker undergoes Sith apprenticeship in order to explore the Dark Side (as well as convert other dark-siders over to his side, and sabotage the newly-cloned Emperor's plans). Naturally, the Emperor takes it upon himself to make a "better", more Darth Vader-like artificial hand for Luke, and he gets an ominous-looking cape and glowing eyes. His costume is very Vaderesque; see it on In the Blood.
A reversal: an issue of Star Wars Infinities, that verse's For Want of a Nail series, has Darth Vader, after going through the same betray-the-Emperor-to-save-his-child thing as in the movie, survives, possibly because Leia was there too. At the very end of the comic, we see him again, as one of the good guys...in a costume basically identical to the old one, just white and with a little more cloth, a little less armor. Considering how little space was left, this might just have been shorthand for "Hey, Vader's part of the Rebellion now!" since readers might not have known otherwise. The costume is memetic now and has its own action figure.
When Gambit of the X-Men was made into Death by Apocalypse, not only his hair turns white and his skin blue-black (say it with me: Uhhh!), but he finally gets the memo that black cloaks are cooler and wears a black bondage cloak instead of his usual, shabby trenchcoat.
Happens instantaneously to Fea in Yamara, when Dark Natasha sneaks up behind the heroes and slip a Helm of Opposite Alignment over her head. Next panel, Fea's gone from ditzy faerie to black-clad biker chick, complete with viper tattoo.
Fea's toad familiar tries to do a costume switch of his own, with sharp false teeth and a spiked leather collar, but is told by Fea not to be ridiculous.
Another Teen Titans example: when Raven had a Face-Heel Turn due to Trigon's influence, she started wearing a bikini under her cloak. She then implanted demonic souls into several Titans, including Changeling (Beast Boy), who wore a version of his red-and-white costume in red-and-black, Matrix-Supergirl, who reverted to the sleeveless spiky outfit mentioned above, and Deathwing, also above, who started wearing a red shirt and a leather vest with even more spikes.
The Plutonian from Irredeemable changes his costume after his Face-Heel Turn from a white suit with a red cape to a red suit with no cape.
In Archie Comics' Sonic the Hedgehog, Fiona Fox originally wore a one-piece jumpsuit. After her Face-Heel Turn, she traded it in for a black pants/tank top ensemble. She also either tied up or cut her hair - either way, it's considerably shorter as a villain than as a Freedom Fighter.
In All Fall Down, Pronto gets one of these in his new identity as the Modern Prometheus.
Inverted in the case of Magneto. First off, he was originally a bad guy, so he has good costume switches. And on the occasions when he's given up the Evil Overlord shtick for a gentler tack — such as when he was in charge of the X-Men — he wore a sleeker costume with no helmet. (There was a joke going around that it was the helmet that made him evil — probably on too tight.)
During the Genosha Excalibur run, where he, Xavier, and a Ragtag Bunch of Misfits work to rebuild and protect Genosha after Cassandra Nova nearly wiped it out, he went from his usual purple to something much darker than anything he's ever worn as a villain (red and blue, but more like black with red highlights and black with blue highlights; it looked like it was perpetually in shadow.) but again ditched the helmet, and also the outfit was less armored. He also adds a belt with never-used pouches, just a few and not Liefeld-level, becoming a bit more militaristic-looking.
However, he usually wears the same costume even as an actual team member as he did as their arch-nemesis.
Films — Animation
Jafar from Aladdin, during his Villain Song near the end, when he's tossing Aladdin around and becoming an all-powerful sorcerer/genie. In that one song, he changes his costume style about three times in less than two minutes. In this case, his evil costume becomes even more evil. Interestingly, his powerful wizard form is wearing his old outfit, so he switches outfits to power up (becomes sultan) and then switches outfits back to power up again. The only difference in the costumes is that the hat and shoulders are more pointy and his snake-staff's mouth is open, representing that his magic is now aggressive like a snake's bite, as opposed to passive, like a snake's hypnotic eyes. Then, he becomes a genie and really changes clothes.
In the 2012 adaptation of The Lorax, the Once-ler starts out in a simple Depression-era cheap suit while he's simply trying to improve the world. When he finally opens his own business, though, he switches to a flamboyant dollar-bill-green outfit that's a cross between a pimp and a steampunk factory owner.
Elsa from Frozen, although she isn't actually "evil", dons an ice blue dress when she sells out her morality and becomes the Snow Queen. Inverted in the end as she keeps it afterwards once she has become The High Queen.
In Legend, Mia Sara's character, Princess Lily, does a Face-Heel Turn and gets a whole new outfit plus Gothy makeup and a hair dye job. If the Lord Of Darkness (Tim Curry) could come up with all this while living in a cave complex, he's probably now in Japan selling to the EGL crowd and rich-rich-rich.
In Star Wars, most of the Jedi knights dress in earthy-colored (brown, green, ivory) natural fabrics. From Attack of the Clones onward, Anakin Skywalker wears...black leather. The Jedi have got to be the least genre-savvy people in the entire galaxy.
Anakin actually wears very dark brown robes in the second movie, which become black after he kills the sand people.
They even lampshaded this in the toys; you can buy lightsabers that switch colors for when you "turn to the dark side".
During the final act of Indiana Jones and the Last Crusade, Dr. Elsa Schneider wears a military style riding outfit, complete with black tall boots and black leather gloves, to symbolize her alliance with the Nazis. This outfit proves to be fashion over function, since she clumsily trips over her boots twice during the grail temple's earthquake and the leather glove slips from Indy's hold when she tries reaching for the grail.
In the fourth series Blakes Seven episode "Assassin", the female assassin pretends to be a slave and spends most of the episode in frumpy clothes, blubbing. Naturally, when the truth is revealed, she stops to change into a rather stylish little black number and redo her hair.
Vampire Willow from Buffy the Vampire Slayer, with her spiffy threads. Not to mention her black ink job in the climax of Season 6.
Willow: [The black leather corset] is a little binding. I guess vampires really don't have to breathe. (Notices own cleavage) Gosh, look at those.
In the episode where Vampire Willow first appears, there was also Vampire Xander, with his leather pants.
Similarly, Angel's switch to Angelus on Buffy or Angel was usually accompanied by wearing a lot more leather. A lampshade was hung on this in season 2, when the possibility of Angel turning evil made Lorne consider the great benefits of Angel in leather.
Also lampshaded in season 1, where Cordelia says that she knows he's still Angel because Angelus would never wear the outfit Angel had on.
Really, any time someone mainly wears leather, they're going to be evil. Other than Buffy herself, who has worn some pretty hot leather pants while still kicking evil's collective ass.
Heroes has Eden, who, after being revealed as a mole, spends a lot of time wearing black leather.
There's also Sylar, who apparently got contacts when he went insane and decided to go around stealing people's brains, not to mention trading in his unfashionable knitwear for a more stylish, predominantly black wardrobe. In one of the alternate futures, he is shown wearing glasses again when he becomes good and stops using his powers.
Maybe he stole a superpower that gave him good vision? And in the future, he decides not to use it?
Lexx had the Brunnen-G, who wore very bright colors. When Kai, last of the Brunnen-G, became an undead assassin for His Divine Shadow, his clothes became a blackened version of the same outfit. This was slightly subverted when Kai joined forces with our "heroes", and his clothes remained black for the rest of the series.
Well, he is still undead. The dead do not need colors.
And then, he was dressed in those clothing, as opposed to choosing himself. The whole point of making undead assassins was that The Order tried (and mostly succeeded) in taking everything from their new servants, including their memories and sense of identity. This was supposed to be doubly ironic in Kai's case, being the one predicted to destroy His Shadow, and turned into a tool of the villain, while his purpose was supposed to be removed, along with his identity (this last part mostly succeeded). It didn't go too wellon the destiny part, though...
Parodied in How I Met Your Mother. Barney's backstory reveals that he became the womanizer he is today due to being rejected by one woman. Classic trope style, Barney shaves, aggressively pulls on his sleeves, then the camera pulls away to reveal his new, entirely black suit.
In a CharmedMirror Universe, the gals' alternate versions are dressed in black. In an episode where Piper temporarily becomes evil, her look changes to what Television Without Pity's recapper aptly described as "Dungeon Mistress Barbie". And then there's the time Prue went undercover as "Ms. Hellfire".
In the first season of Who Wants to Be a Superhero?, when the Iron Enforcer became the Dark Enforcer, Stan Lee gave him a new (almost entirely black) outfit.
At one point in Red Dwarf, the ship and its crew acquire dark and light versions of themselves. The Light Crew, predictably, dress in white and gold, while the Dark Crew look like every stereotype you've ever seen of goth S&M freaks.
A less extreme version occurs in an episode of Star Trek: Voyager, where the holographic Doctor's data back-up boots up in an alien museum and finds that history has painted the Voyager crew as villains. Their uniforms already being mostly black, the main difference was the inclusion of black leather gloves, although Chakotay had a larger tattoo on his face and Seven was still Borg.
The undershirts were black instead of the usual grey, as well.
In the originalMirror Universe episode, the Imperial Starfleet wore a more gaudy uniform than the originals, with gold sashes and lots of decoration. Kirk's uniform top was a metallic vest, and female crewmembers wore midriff-exposing vests. The Deep Space Nine mirror episodes went for the leather.
In an episode of Lois and Clark, where Clark suffers Grand Theft Me, his hijacker dresses him in leather pants and a black lycra shirt. Quoth Lois: "Change out of that stupid outfit, honey."
Clark wears blacks, greens, and reds when evil instead of his usual blues, reds, and yellows. Subverted in season 9, where his superhero costume is black and silver, but he is still goodnote Clark has turned his back on human emotions, so the black and silver represent Krypton, since the Kryptonian uniform is black with a silver S.
Chloe is once affected by some parasites that makes her go crazy over Clark and doesn't miss the chance to mock Lana on the way about it; she wearsonly black compared to the varied colours she normally wears. She even dyed the tips of her hair black.
The other time was a bit awkward as she happens to be wearing black when Lionel persuades her to turn against Clark.
In "Wrath", Lana also wears only black after she gained kryptonian abilities and went psycho.
Possibly the subtlest is Londo on Babylon 5, whose clothing slowly turned darker and more militant over the course of the first two seasons, without ever changing the basic style.
Lampshaded by Vir: "...there's no question the ambassador is going through changes. He even LOOKS different."
In an episode of Flash Gordon, Dale is possessed by a witch and dons a vampy red dress and lipstick. Confusingly for the viewer, this makes Dale look like Princess Aura, who has similar facial features to Dale, but is distinguished by...her red dress and lipstick.
In the BBC's Robin Hood, both Allan and Isabella start wearing copious amounts of black leather immediately after their Face Heel Turns. Lampshaded by the sheriff after Allan shows him several of Robin's secret routes into the castle: "Upgrade this boy to leather."
24 does this to Tony Almeida by having him switch to a shaved head, a beard, and a black leather jacket when he's working with the terrorists at the beginning of season 7. But it actually gets zig-zagged: Almost immediately it's revealed that Tony is actually undercover and secretly working with Bill Buchanan and Chloe O'Brien to stop the terrorists, but later on three quarters into the season it then reveals he's working with another set of terrorists. By the time Tony's done this, he's actually lost his leather jacket by that point.
This happens in The Wall—the 1980 tour, the 1982 motion picture, the 1990 Berlin show, and (mostly) the 2010 tour—when Old Pink turns into "Dark Lord Pink". In the original tour, Roger Waters wore an over-the-top, rhinestone-studded trenchcoat; in the movie, Bob Geldof got an Oswald Mosley-esque makeover; in Berlin, RW wore a Field Marshal's costume; and in 2010, RW sometimes uses nothing more than black clothing with a crossed-hammer armband, but at other venues, the costume is a bit more elaborate.
Hulk Hogan's Face-Heel Turn to Hollywood Hogan in WCW involved a switch from his trademark red-and-yellow tights to black tights with lightning airbrushed on them. He also started wearing black and white feather boas, and white-rimmed sunglasses, and grew a 5-o'clock shadow and dyed it black (which looked rather odd and sinister next to his platinum-blond hair and mustache).
Sometimes, their new outfit is trunks, if they previously wore long tights as a face.
Triple H followed both examples in 1999 by shortening his hair, switching from colored long tights to black trunks, and trading his DX music for the Corporate theme and, eventually, "My Time". Even his mood lighting changed (from DX's green flood, Corporate red to his signature ominous multicolored flicker).
John Cena traded short trunks for shorts in his gimmick change from generic heel to delinquent white rapper.
Chris Jericho traded his signature long tights for briefs in his 2008 heel turn.
The Undertaker's "death", after Kane helped Vince McMahon beat 'Taker in a Buried Alive match, caused The Undertaker's transformation from Biker to Super Human Zombie after his several-month-long absence. In his absence, he seemed to have grown taller and got more buff. He also grew out his hair, got a Van Helsing-esque suit, and mastered the ability to roll his eyes back after he took off his hat in a slow, dramatic fashion. He also got a new "signature move", which included him popping right back up after being allegedly knocked out, then proceeding to win the match.
That actually was all part of the Undertaker's gimmick in the 1990s (when he was depicted as a Wrestling Zombie Gravedigger). They downplayed this as time went on. By 2003/4, they stopped pretending the Undertaker was undead, instead portraying him as a Badass Biker. Fans actually preferred Zombie Taker, so the Undertaker's "death" and return to his original gimmick was to address the complaints.
Though, due to the difficulty of manufacturing power armor in the Eye of Terror, about the only way for a Chaos Marine to get a suit of Terminator armor is to kill the previous wearer.
They don't. There is no canonical backpack shape, but the models assume that the player is making CSM from one of the "original" nine traitor legions, hence the fancy backpacks. The best way to make "newly-evil" Chaos Marines is to buy a Tactical Squad and a Chaos Space Marine squad and combine the pieces to make 20 men, thus keeping the mostly Imperial armour but with a few new Chaos goodies..
At the start of the second act of Gilbert and Sullivan's Ruddigore (in productions that don't bump it up to the first act curtain), Robin Oakapple, following his Face-Heel Turn at the end of the first act, reappears as Bad Baronet Ruthven Murgatroyd; originally, his faithful steward Adam was to have changed his name to Gideon Crawle to suit his new appearance as the evil henchman, but this name change was undone during the original run except for one line that Gilbert missed.
From some of the flashback cinematics, it's clear that this is very similar to what he wore before he started pretending to not be a Manipulative Bastard.
Common in the Star Warsverse, where a shift to the Dark Side is indicated by a switch to black robes and a red lightsaber (if you remove Dark Bastila's robes in the first Knights of the Old Republic, you'll find she's also changed her underwear). The facial features also tend to become more twisted. Inevitably, female Dark Siders look like Goth dominatrixes, while Dark Side males look like George Romero rejects.
In fact the player character's underwear changes if you go dark side too. This is due to the developers not bothering to give varying dark side skin tones to the body models (since you're rarely unclothed anyway) and instead you get a full body black suit with red Sith symbols.
Kreia does this, as shown in a cutscene right after the Exile arrives on Malachor V.
Word Of God reveals that Atris and her handmaidens were meant to change their white robes to black after Atris' Face-Heel Turn, but it seemed implausible for them to keep black robes around.
The main character's underwear will change too, but oddly, the Dark Side underwear is actually more conservative, basically consisting of a full body stocking. Those Siths. Such prudes...
In the recently-scrapped Star Wars Battlefront sequel, there was supposed to be a Sith version of Obi-Wan Kenobi. Of course, there was a costume change that gave him a lot of similarities to the Emperor.
In the Rumble Roses games — all-woman wrestling titles — every character has a face and heel persona. Most of the heel costumes follow the pattern, except for the characters that start as heels. Race queen Reiko becomes a biker chick, cowgirl Dixie turns into a Stripperiffic cop, and conversely punk-rock schoolgirl Candy Cane becomes a strait-laced student/cheerleader.
In La Pucelle: Tactics, the character Eclair develops a "Dark" side, which appears to wear nothing but black lingerie, especially when compared to the dress she normally wears. Prier gets one also, scoring a new outfit similar to the one Succubi wear.
In the Heaven's Feel scenario of Fate/stay night, Sakura drops her rather plain pastel outfit and goes with a form-fitting black dress with red trimmings instead. Since the dress is made of pure magic, she's technically naked.
In the same scenario, Saber also gets one of these upon going bad.
Anders in Dragon Age II changes from his old, light blue-grey and light brown robes into a black and grey costume once he loses any hope of improving the mages' lot peacefully.
In Disgaea, Flonne gets a new red-trimmed outfit after becoming a demon. She also gets a pointy tail and little demon wings to go with it.
Inverted in The Force Unleashed, since the story is meant to be about redemption. As the story progresses, Starkiller gradually changes from a very menacing set of Sith robes to a set of white, yet still badass Assassin's Creed-esque robes. Of course, this is the canonical version. The player can choose to change their costume throughout the game. This is paired with a switch from red to blue lightsaber color when you "defect".
In Jeanne D Arc, all of the Transformations tend to look somewhat evil. Additionally, when Roger pulls a Face-Heel Turn and is overtaken by the Reaper within him, he doffs his traveling clothes and wears a dark, menacing suit of armor. Subverted when he still wears it when he's a guest with you, and you still can see him wearing it.
Most of the signature heroes in City of Heroes have Mirror UniverseEvil Counterparts who typically favor darker colors and spikes and such. The two exceptions are the Dark Is Not Evil Infernal and already deeply disturbed Malaise; tellingly, their Praetorian counterparts share their names as well as their costumes.
Prince Arthas, in Warcraft III, after taking up the soul-stealing sword and becoming evil, also manages to pick up armour with a lot of skull motifs and a long purple cloak. Also, his skin and hair turn deathly white. Apparently, he's able to stroll right back into his father's throne room looking like this without raising anyone's suspicions.
In the "bad ending" route of Castlevania: The Dracula X Chronicles, Richter's girlfriend, Annette, gets turned into a vampire/succubus by Dracula and ends up wearing skanky black succubus lingerie.
In the second Castlevania Pachislot game, the dancer/sorceress Angela gets turned into Dracula's minion and goes from wearing white and blue frills to a barely-there red-and-black leather one-piece. Being Ms. Fanservice, both her good and evil outfits are actually equally Stripperiffic.
In Tales of Symphonia, whenever you see Kratos after The Reveal, his outfit has switched from his usual purple skin-tight thing to a white jumpsuit with more belts than is really necessary. He swaps back to purple when he rejoins the side of good. If you pick him over Zelos, you can get the white belted outfit as an alternate costume.
In Arc Rise Fantasia, when it's revealed that Adele is the Real Diva, she swaps outfits so that she wears a shiny red dress that looks like it's weaved out of oversized ribbons, and gets a funky tornado-like head-dress to match.
Fawful from the Mario & Luigi games gets one of these when he becomes Dark Fawful. After the wardrobe change, he gets evil red eyes, a Cackletta-esque cape/cloak that is dark purple and grey, his black jumpsuit is the same, but instead of a belt, it has the image of the dark star on it. His headgear has also changed to fit his new look.
Humorously played in the fifth episode of Sam & Max: Freelance Police Season 2. Just before the Soda Poppers battle the heroes, they switch into demon outfits. Whizzer and Peepers wear black versions of their Soda Poppers uniforms with flames. Specs, on the other hand, changes into S&M wear and chides the others on their lack of imagination.
In Tales of Monkey Island, when Elaine is turned into Lechuck's Demon Bride, her usual attire is replaced by a black gown and a spiky black tiara. Interestingly, she never changes back, even after Guybrush manages to undo her demonic transformation.
The Wii version of Punch Out takes this trope Up to Eleven in Title Defense Mode. It takes every single opponent in the entire game, gives them all a badass makeover (with a few exceptions; Glass Joe will never, ever, EVER look badass), and makes them all horribly, HORRIBLY harder than they are normally. Some of the makeovers have practical purposes, namely, Glass Joe's headgear and King Hippo's...uh...manhole cover, but for the most part, they just make them look different and distinguishable from their weak counterparts, not to mention Darker and Edgier.
In Kingdom Hearts, when Riku opens his heart to the darkness, his usual clothes are transformed into a shirt that looks like it's made of black and red muscle tissue with a Heartless emblem on the chest and what looks like a hula skirt.
Ace Attorney has Godot. While he isn't evil, he had black hair with a red shirt while a defense attorney and mentoring Mia. After his poisoning, he became a bitter and petty prosecutor. His hair was bleached as a side effect of the poison, he uses a visor due to eye damage, and wears a green shirt rather than red because he can no longer see the color.
The Pokemon Mystery Dungeon series games has Dialga change from a blue dragon with green stripes and white spines to a black dragon with red stripes and gray spines after turning evil and becoming Primal Dialga.
Happens in Pokemon Ranger a few times. Most notably Kincaid, upon revealing himself as The Dragon for Dim Sun, he...twirls around a few times and changes into a black suit and cape with Dim Sun's logo on it. He also gets a pair of completely black sunglasses, which resemble Blake Hall's. It's from then on he tries to murder you at every opportunity. In Guardian Signs, Edward ditches his white suit for a black one when revealed as the Big Bad...until Purple Eyes shows up.
Some members of the old Team Plasma have become The Atoner and kept the white uniform, standing in contrast to the black uniforms the evil Team Plasma wears; this makes it a kind of Good Costume Switch, without actually changing clothes.
Fire Emblem 3 provides a strange inversion, probably induced by technical limitations - when Emperor Hardin is defeated and freed from Gharnef's control, his facesprite changes from his malevolent red emperor garb to the simpler white turban and cloak he wore as a playable ally earlier in the game before he dies. This can probably be chalked up to a desire to save on space by not making a portrait that'd be seen for all of ten seconds before never being used again; the DS remake, which doesn't feature the part with Hardin as an ally, fixes this by giving released!Hardin a variation on the emperor garb portrait with the Glowing Eyes of Doom removed, instead.
In the comic prequel to Injustice: Gods Among Us, those that are part of Superman's Regime change their costumes accordingly. Some, like Superman, are subtle. Some, like Wonder Woman and Green Lantern, are massive (GL's case is that he lost his Green Lantern Power Ring and switched up for a Sinestro Corps ring.)
A small example occurs in MegaTokyo, where Miho's Endgames character is not seen wearing Miho's synonymous hair ribbons until just after betraying Pirogoeth (he/she is even seen putting them in shortly after this happens).
Homestuck: Gamzee Makara's Face-Heel Turn is first demonstrated by a change in his typing quirk, which goes from aLtErNaTiNg CaPs to alternating between all lowercase AND ALL CAPS; considering that, earlier, he said that typing in any way not lIkE tHiS feels unnatural, it serves to cement the fact that something has Gone Horribly Wrong. Additionally, his clown makeup is smeared and cracked, and, at one point, he wore Equius's shades and Nepeta's cap, trophies from the two trolls he murdered (and he managed to look positively in both).
With the use of the Tiaratop, Her Imperious Condescension brainwashes Jane, switches the colors of her godtier outfit to Betty Crocker red and white, makes her skin even more pale than usual, turns her eyes black with red irises, and makes her text color (except for her name) turn red.
Not quite evil, but in Kevin & Kell, Kell changes from peach colored business outfits to dark red ones when she becomes CEO of Herd Thinners. Then again, CEO of Herd Thinners is more of a Necessary Evil position, given the nature of the Kevin and Kell universe, and Kell is much more fair than her predecessor was.
And now she's switched to a more neutral green now that she's set up a rival company to Herd Thinners with funding from the decidedly more corrupt Rabbit Council.
In The Order of the Stick, during the Soul Splice, Vaarsuvius' red robes turn black and his/her hair goes wilder.
From the Global Guardians PBEM Universe, when Fury suffered a Heroic BSOD and turned from a superheroine into a crazed criminal-killer, she changed her costume (which was already Stripperiffic) from a red, midriff-baring halter and tight pants to a black thong bikini-and-leather jacket combination.
Generator can't resist playing with this trope in the Whateley Universe every time she gets to play a supervillain in the holographic simulations. The first time, in Team Tactics class, she goes for the Dragon Lady look with a cheongsam. In "Ayla and the Mad Scientist" when she is asked to play 'the team member who has gone Dark Phoenix' in the holographic simulation, she goes with glowing black eyes, Kirby Crackle, and a black and purple minidress with Absolute Cleavage.
The "Justice Lords", Alternate UniverseKnight Templar versions of the Justice League, all wore redesigned costumes with much more black and monochrome. Except for Justice Lord Superman, that is, whose costume was mostly white, reflecting his more black-and-white view of morality than "our" Superman. Note that Wonder Woman's famously Stripperiffic outfit becomes extraordinarily conservative for her evil version, either inverting the trope or reflecting the moralizing Knight Templar philosophy.
Robin: when he dons the Red X costume in order to catch Slade, entering Knight Templar territory. And again, when he becomes Slade's apprentice, wearing another black costume with armor plates and a spikier mask.
Raven is briefly seen with a red cloak and the four eyes of Trigon - never a good sign. This one shows up again in the comic; a red-skinned Raven is seen when she's under the influence of her demonic father, and a white-cloaked version appears after she's purified of said influence. Inverted when Malchior is teaching Raven dark magic, whereby Raven's robes turn white.
When Cyborg goes undercover in the Villain School, he designs a "villain" costume for the occasion, along with his disguise (as himself without cybernetics): himself with rock skin.
The rather late origin story episode featured Starfire with a much blacker, more armored costume, along with an alien and less-than-girly princess crown. She was a villain for about half the episode, during which she was very badass.
Beast Boy...doesn't actually get an evil costume, unless you count his shapeshifting into The Beast, then yes, all the Titans had an Evil Costume at some point or another.
Terra also gets an evil costume switch or, rather, two. The first time we see her, she's wearing a fairly normal-looking outfit. Then, when she leaves and returns later, she's wearing a cooler, but out-of-character, black outfit. Then, when she becomes overtly evil, she gets this much uglier, metallic-looking body armor.
When the HenchCo made Mood Reverser was accidentally used on Ron, he simply continued to wear a fictional villain's costume for the rest of the episode. His villain outfit was, in fact, quite lame. His regular clothes turned to a Fonzie-style badass look. Also, his skin turned blue as a result of getting an infusion of blue-skinned Dr. Drakken's evil, while Drakken's reverted to pink fleshtone.
During the second appearance of the Mood Reversal device, there wasn't any costume switching. However, when a person was hit, they would glow Red for evil or Blue for good. The only real change that could be noticed was that evil was less cowardly and Ron Stoppable was competent.
Shego began dressing in a Teacher uniform after being hit by the Moodulator. Good Costume Switch?
Averted with the Face-Heel Turn in Shego's backstory; her current costume is the same one she wore when she was part of Team Go.
Done straight, then reversed in Avatar The Last Airbender. For all of Season 1, Zuko wore fairly standard villain wear for the show. Lots of militaristic red, Shoulders of Doom, the whole enchilada. Season 2 had him "on the fence", so he wore mostly nondescript clothes, in the greens and browns of the Earth Kingdom, whose members we had seen both as heroes and villains. After his subverted Heel-Face Turn in the season finale, we see him wear the full black-and-red military garb of Fire Nation royalty, the same as Azula. After he has a real Heel-Face Turn for real, he gets a red-and-gold costume that isn't nearly so intimidating...though it still looks cool.
Also, Ozai in the finale, kind of. He switches to more regal looking robes when he declares himself Phoenix King and goes off to obliterate the Earth Kingdom. In this case, it's more of an Eviler Costume Switch.
Code Lyoko: after being possessed by XANA and falling in the Digital Sea, William gains a fully evil (and skintight) costume of black and red spandex with what is sometimes described as a corset (maybe to symbolize his servitude to XANA). His sword also gets a full change, with a prominent Eye of XANA and evil-looking black veins all over.
One episode had Timmy wishing to do the opposite of whatever his parents tell him to do in order to escape their overbearing nature. Unfortunately, they tell him to "be good", which immediately transforms him into a sinister villain with a long black cloak, classic top hat, and an evil glint in his eye.
In yet another episode, when Golden Locks, the Crimson Chin's fiance, transformed into Hair Razor as a result of Timmy's wish, she goes from wearing a short dress to becoming a leather-clad bitch.
In Gargoyles, when Elisa went undercover to infiltrate Dracon's protection racket, she changed into a low-cut belly top and leather jacket and trousers to seem more criminal-like.
When Shockwave from Transformers Animated is still disguised as Longarm Prime, he is mostly colored blue and gray, but when all of the Autobots find out that Longarm is actually Shockwave, he actually changes to purple and white (the same colors as G1 Shockwave) to show that he is indeed a Decepticon.
When Megatron made Rhinox into a Predacon, his brown hide turned purple and the gold plating turned silver.
Subverted in the first episode when Dinobot goes from being a Predacon to a Maximal, then played straight a couple of seasons later when Megatron resurrects him as a Predacon, though justified since Megatron is using Transmetal technology.
Justified in season 3 when Black Arachnia turns from Predacon to Maximal due to the Transmetal driver.
When Grune from Thunder Cats 2011 reveals himself to be a traitor, he discards his Thunderian armor and dons gold raiments emblazoned with the symbol of Mumm-Ra.
Jane Porter has actually dressed as Queen La at least twice in The Legend of Tarzan, when La turned her evil.
Artemis dons one as Tigress (a reference to her villainous comic book counterpart) when she fakes her death and becomes a Fake Defector, as well. Her outfit consists of a dark orange and black armored bodysuit and a mask. A glamour charm from Zatanna makes her look like a brunette. Subverted in the finale, as Artemis decides to become Tigress, albeit with her natural hair color.
TRON: Uprising demonstrates this retroactively with Paige, a medic turned elite soldier. As a medic, she looked no different than any other program, clothing-wise. As a soldier, her shoulders are exposed and she has Combat Stilettos, in addition to the recolored Tron Lines.
Metalocalypse - Toki goes all dark and evil, forsaking his childlike ways, and to illustrate the point, wears blood and lots of big spikes.
In My Little Pony: Friendship is Magic Trixie dons a dark cloak in lieu of her purple magician's costume when she obtains the Alicorn Amulet, which turns her crazy and evil. Once the protagonists remove it from her, she eventually returns to her usual costume and personality.