Simple panties and a bra, nothing else. And the more revealing the better. Little skimpy panties that barely cover what they are supposed cover. Not a fan of the boy shorts. The bra I'm pretty indifferent about, unless its just some boring brown colored one.
all of it! trust me a woman that will wear if for a man is a wonderful thing, problem is it never stays on long anyway, but just in case make sure it is something that is comfortable to wear and wear it as long as you can to prolong the moment. also something that brings out your best features, boob, bum, legs, etc, you get the poing