If you're looking for something comfortable, sexy, aerodynamic, sexy, smooth, and sexy for your characters to fight in, party in, or just walk around in, there's no reason to look no further than skintight pants, preferably spandex or leather so that they can be shiny too.
Unless they're spandex, the "fight" part doesn't really work. Seriously. Female characters with nice legs and buttocks almost always feature a fanservice-heavyfighting style with lots of high kicks. Ask your local tae kwon-do coach to teach you some high kicks. Now put on some skin-tight leather or denim pants. Now do your high kicks. See the problem? That problem arises only if we're assuming our super woman hasn't broken an ankle running about in stiletto heels or thrown herself to the ground from her own forward momentum, of course.
These are gold mines for having fanservice without looking too blatant and seeming hip at the same time: they're tight and shiny, which means that they show off every curve and contour of the wearer's body, and, in games, allow for heavyJiggle Physics. Extra points if the wearer is wearing a top made out of the same material, covering all the fanservice bases.
These really became popular in the Seventies and Eighties, and are used much, much more often on females than males. See also Most Common Superpower, as clothes like this are used to emphasize that.
See also Superheroes Wear Tights.
Note: Full skintight bodysuits are a different trope altogether, as are cases when the outfit really is painted on. Form-Fitting Wardrobe is for when clothing clings like this but is made of materials that shouldn't.
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Anime and Manga
In Mahou Sensei Negima!, Chachamaru occasionally wears stuff like this. Not to mention that she has thigh high stockings literally built into her synthetic skin.
Neon Genesis Evangelion justifies this by having the costumes start out loose and baggy, but conform to the body with a vacuum-seal.
Nausicaš of the Valley of the Wind has the titular princess in form fitting white leggings however as Miyazaki is a feminist they aren't really played for fanservice. However the film did once have a reputation for having viewers think that Nausicaa was flying around pantsless and underwear free due to old VHS fansubs where the footage had degraded so much through multiple copying that they looked more skintoned in colour.
Marvel is all over this; Basically, any Marvel superheroine who isn't wearing a full bodysuit has this, and every other female character after that.
Nearly every X-Woman has had an outfit like this at one time or another. Storm has this when she's not using her other outfit, several characters have this as their main outfits, such as Jubilee, Emma Frost, and Marrow.
Male comic characters also frequently appear to have been drawn naked but with Barbie Doll Anatomy, and then colored like a Captain America suit, to the point of details like belly buttons showing. Really, clothes hanging like actual clothes is the exception, not the rule.
Used quite obviously in X-Men Legends, where every single female character wears something like this or tight jeans which have the same effect.
The page image is Amy Adams as Amelia Earhart in Night at the Museum: Battle of the Smithsonian. (Adams on donning the pants: "Hey, I do have an ass!" Heterosexual men and lesbians everywhere: "Hell to the yes.")
"Sandy II" in Grease. Olivia Newton-John had to have the pants sewn around her legs, so tight were they.
Skinsuits, the standard issue airtight, skintight spacesuits in Honor Harrington need to be custom fitted for each person. later even Nimitz the treecat get's one.
Live Action TV
Buffy the Vampire Slayer gives us Faith, a sexy badgirl who definitely enjoyed flaunting her assets with her signature skintight leather pants. Buffy also got in on the action occasionally with ultra-snug leather pants of her own, though hers tended to be either red or pink.
Erik Estrada of CHIPs admitted the costumers sewed in extra zippers on his pants at strategic places.
Half the cast in Blake's 7, Avon in particular. The infamous "lobster suit" apparently gave Paul Darrow some trouble when it came to running.
Jenny, the Doctor's daughter in the new Doctor Who.
River Song is also fond of pants very similar to the ones in page picture, even managing to run and fight in them.
Amy Pond generally opts for these when she's not in the mood for her usual mini skirts.
Kurt Hummel from Glee. His pants are sometimes so ridiculously tight you have to wonder how he can even walk in them at times. And he does do high kicks in them. Check out both 'Rose's Turn' and 'Time Warp' for proof.
In another male example, Dr. Spencer Reid of Criminal Minds sometimes wears pants that show off his long legs and assets.
Robert Conrad in The Wild Wild West - his legwear of choice is so tight that in fight scenes they were prone to splitting (and not always off-camera, as "The Night of the Pistoleros" demonstrates).
In The Rose Tattoo, Serafina examines her daughter's sailor boyfriend from the front and back and asks him why they make Navy pants so tight. "That's a question you'll have to ask the Navy," he tells her.
Popular in Professional Wrestling, for both male and female wrestlers. This occasionally comes up for characters who are homages to wrestlers as well (such as Hugo from Street Fighter).
This was often used in earlier 3D games due to technical limitations. You don't need to render creases and ruffles for something that literally looks painted on.
In Soul Calibur III and IV, given the setting, no character wears this except, arguably, Xiangua, but in the character creator (where they have everything from eighties clothes to skintight chainmail) you can set female characters to wear these. In Soul Calibur 4, with it's constant Clothing Damage, it usually comes down to either these or underwear/bikinis.
Taki's entire outfit seems painted on. She's basically modelled as though she were naked but coloured red.
Sonya Blade alternated between this and less tight pants, though she stopped wearing these in the later games.
City of Heroes, saying as how it's of the superhero genre, has a multitude of shiny tight pants options, from spandex to leather to metal.
World of Warcraft uses these for most equipment, using different pieces attached to the base model to make it unique. It gets a bit ridiculous for some equipment, for instance skin tight plate mail or skin tight tuxedos.
Final Fantasy XI uses this for some equipment, notably Elvaan starter gear, both male and female.
Miranda Lawson from Mass Effect 2 certainly lives up to this trope. Her second outfit that you can unlock by completing her loyalty mission makes her look as if she dips herself in a bath of liquid black latex every morning.
Old Snake from Metal Gear Solid 4, Justified, as loose clothing would hamper his sneaking ability, and it's a muscle suit about an inch thick, to make up for his old age.
Fenris of Dragon Age II has very, very tight pants. One wonders what they're made of, given that his low-tech world is unlikely to have spandex; his outfit is given no more in-game description than the mystifying "Grafted Spirit Hide." (How does a spirit have hide?) Rule of Sexy probably applies.
Velvet Assassin: A few missions in Violet abandons her bomber jacket and jeans in favor of something a bit more... flattering to her figure, but still tasteful and functional. The tight leather pants seem like they were molded into the perfect shape of her butt.
In fashion fetishism, they have the concept of a second skin, where a fabric usurps the sexual role played by bare skin.
"Skinny jeans" are all the rage, and for good reason—when it comes to attracting the desired gaze, they work. Leggings are even more so. Now there's even faux denim leggings ("jeggings"), complete with false pockets.
An urban legend tells of how a vain person sat in a hot tub with jeans on in order to shrink them into skintight-ness, unfortunately the jeans shrank so much that it ended up killing the person from loss of circulation.
English riding breeches. On purpose.
Running tights. For that matter a lot of athletic clothes are skin tight. It reduces chafing, helps wick sweat away, and if you're an athlete, shows off that body you've been working so hard on.
Cycling shorts are so tight, racing designs tend to shy away from white because they can be a little too revealing.
Swimsuits for professional swimmers are getting nearer and nearer to this trope...so much so that the international swimming federation is starting to crack down on suits that are too painted on...(this is justified however, in that the less loose fabric, the less water resistance)
A properly-fitting wetsuit tends to be like this. And you think tight jeans are hard to take on and off, try ones made of what basically amounts to a body-shaped non-slip mat.
Spandex in bike tights, et cetera. Spandex hadn't been invented when they first drew Superman, and George Reeves' costume in The Adventures of Superman is almost baggy by comparison with Spandex.