It really all depends on what you want from the guy. If you want something long term, go with a bit of make up, but nothing flashy or showy, while wearing a skirt that ends just above the knee. To him, you'll look like someone he can keep around.
If you really just want sex, go with a good amount of cleavage, shorts that end around an inch or two past you panties, and wear all the shiny make up you want. You'll appear more sexual to him, and get that reaction from him.
It really all depends on what you want, and how much you want it.