Do not dress provocatively if you're a woman. If you're man, wear something like slacks and a nice shirt. Don't wear a suit unless you're coming from work. Also, don't wear jeans and flip flops unless that's the kind of girl you normally are. Don't dress like someone you're not. If you normally wear your hair wild and sexy, wear it in the way you normally wear it. Don't pull it up in a bun, because that person is going think that you're a different kind of person. Women shouldn't show cleavage, wear something super tight or skimpy, and should absolutely not go braless. Don't be provocative. He can see what kind of shape you have, so you don't want to tease him.