3. Cordelia Chase (Charisma Carpenter) as a Cat in Buffy the Vampire Slayer
Air Date: 10/27/97
So what if cat ears and whiskers is the least original costume a woman could wear? Does that matter when a stunner like Charisma Carpenter pairs them with a skin-tight cheetah print jumpsuit? In "Halloween" everyone becomes their costume thanks to a mischievous sorcerer, but thankfully Cordelia went name-brand and bought hers at Party City, so we get to watch her run around as her sexy self and not an actual catwoman for the whole episode.