I saw a girl last night in the bar who wore the sluttiest costume I've ever seen IN MY LIFE.
She was "Super Girl", apparently, if Super Girl's power is the ability to flash camel-toe at everyone.
She literally wore a white tanktop (no bra) with an "S" drawn on it, and then a pair of white cotton panties. Not boy-shorts, not spandex shorts, not bikini bottoms, not really-really-short shorts - they were panties.
I think she also had a cape, but I couldn't be sure since I was mesmerized by her crotch region.