It is more about the woman's attitude, air, arua. If she has self respect then it shows. If she turns down punks that just want into her pants because she knows that she can do better. She gets a certain air of respect from her freinds. Who when talking about her do it with respect that guy guys pick up on. If you act like a lady then that is really attractive to guys. But you also need to dress with modesty otherwise they just think that your a self rightous tramp that lets every one look at her hooters.
A big part of it is looking your best. If you know what guys tend to like about your body, ensure that those parts are well represented.
If you're looking for a one-night-stand, "well represented" means seeing daylight, or close to it. If you want something more long term, "well represented" means he's got a pretty good idea of what's there, but will have to get to know you a bit before finding out for sure.
Guys have a variety of different tastes when it comes to women's clothes. If in doubt, think feminine.