Any CAR salesmen out there?

I'm going to start next monday and don't know what to wear, don't know how the environment is going to be (considering there is only 1 lady besides me). I've always been slighty tomboyish and don't mind hanging out with guys (in fact I prefer it -- less gossip) But I don't want them to take advantage of my lack of knowledge and experience... Can anyone give me any advice as to what to wear and how to act?? Thanks