What are you being for Halloween? Sexy Alfred Hitchcock? Snooki imitating Willow Smith? Whatever your choice, you probably think it’s pretty cool. But do you know what would give your costume even more cred? If it were vintage. We’re not talking some lame hippie vest or a stupid beatnik beret that you got from the mall. We’re talking a costumes that people wore in the 70s. That their ex-wives are now selling on eBay.[ITPGallery]