ZOMG Need last minute Halloween help!

So I originally wasn't going to dress up for Halloween at all. Last minute I get invited to a Halloween party. Its tomorrow nite and I'm trying to throw something together really fast.

I'm going for something that's not to cliche. And I'm shooting for something to maintain a little bit of sex appeal without looking like a generic Halloween slut. Cause I mean, really, its october and its cold. So no thanks, I'd rather NOT freeze.

I just need help! Making something last minute isn't really an issue. I have at least all day tomorrow and most of today and wouldn't mind staying up all night either.

Any ideas would be greatly appreciated! Thanks guys!