"Slang" is uncountable. You can't need some slangs, you need some slang expressions. I'd love to help, but I don't know what you mean. Do you mean slang that might be heard at a fashion show?
The Urban Dictionary is good for that sort of thing ( http://www.urbandictionary.com/ ) and not much else. Just poke around in there. I don't get out enough to have heard much in that arena, but I can give you "fashionista", a woman aggressively obssessed with fashion, from "f