Guys don't care what you wear as long as it gets their single-minded (very similar to simple-minded) attention. They pretty much don't know one color from the next. You are correct to include cup size in your question, as that's pretty much all we know about womens clothing. As far as that topic goes, men mostly like the biggest cup size possible. So, there you have it, dress accordingly.
1st feature I look at is eye brows. Odd I know. then I look at the boobies! I do not like big boobies. I am more of a small boobie guy tho. nipple size location, brest shape and perkyness is what I look for.