I have heard the white version runs large in the cup and band. I usually wear a 32G, and followed the advice I get on Curvy Kate's molded bras- band size down, cup size up. The band was still a generous fit, and the cup was pretty generous too- I may have been able to go down a cup, sometimes it is difficult to tell with half-cup bras. In either case, it gave me lovely uplifted round shape.
Looks and practicality- The satin looked lovely, and the colorway rich, but the ruffles looked silly on me (I'd been apprehensive but thought I would give it a shot). Moderate cleavage for me, thanks to the lift. However, I generally wear close-fitting tops and the ruffles showed bumps under pretty much all of them.
This bra is not for most ladies in summer. If you often wear sweaters or thick tops, however, it will give you an amazing shape and look fun as well!