On Angie's thread about swimming attire, I had mentioned that I'd ordered these from Zappos:

http://www.zappos.com/p/next-b.....48/color/3

http://www.zappos.com/p/next-b.....962/color/

They arrived and fit beautifully (go with the size you think you'd be). Just wanted to note, since I think it's not mentioned in the description, that these have nothing inside to support the bust.

At least, the XS does not. Larger sizes may, but otherwise you'll have to either go without or put something beneath the suit.