Depends on body type. Thin girl, small butt, long legs, big boobs - then the classic black pencil skirt with white buttoned shirt and patent black leather high heels (not stilettos), hair pulled back in a pony tail is a good look. If you're rubenesque, not so much.
Baby doll dress is nice, Monique St. Divine has a nice picture that I like a lot.
What I don't see a lot of is the woman just getting out of bed ( white sheets/comforter, wood floors), "messy" after sex bed hair, white men's shirt (not buttoned down), unbuttoned all the way with bikini panties underneath. Sipping a steamy hot cup of coffee held between her hands - hot. Excuse me while I go take a cold shower...
Tight jeans and white T-shirt, no bra.
Also, often times more clothes are better than less. We like unwrapping the package. I wish more providers would be fully clothed with lingerie underneath for appointments. When asked for clothes requests, I often ask for jeans, t-shirt, and sexy lingerie underneath.
Too many variable to be specific to different tastes, though. That and guys are all over the board in what they like, but in general the classics are safe.