No other convention may be more essential for superheroines than to dress as skimpily as possible. It's still a man's world in the comics, as they say, and the women still have to play by their rules. One of them is to show as much skin as possible. Probably it distracts the men enough so they'll not fight but bust gape. If the girls are lucky, their foes' eyeballs will pop out and they'll die from eye bleeds.
Now this may seem tame, but I started with a personal favorite. Her minidress-type of costume, has a really low v-cut that just ends at her navel. Yes, more conservative than most costumes, but this costume has an appeal that just is oooh-too-feminine.
Emma Frost has been more of a showy dresser even back then. As if her original dominatrix-based costume during her Hellfire Club days wasn't that showy. But her Phoenix Five costume and this one... you know she likes to push the envelope.
#48 on The Best Comic Book Villainssee more on Emma Frost
Back in the 80s, she seemed to be the sexy but kinda naive type of alien girl in the Teen Titans. Now she's probably all grown up and so affected by global warming that she has to dress for the occasion.
Also Rankedsee more on Starfire
You know you're a superheroine when your costume tries to show as much flesh as possible while still covering the essentials. Star Sapphire fits that just right. Cosplayer Margie Cox (pictured) will agree.
Also Rankedsee more on Star Sapphire