I'm 5' 10" tall, with a 40" band size (40" chest measurement beneath my breasts). My natural size is an A-cup.
I think I look best en-femme with a C or D cup, and I currently have forms that range from a C to a DD cup when I wear them. I have the DD set because I forgot to allow for my A-cup breast tissue behind them, so what was advertised as a D-cup, with a flat back, on me becomes a DD cup. The DD set has occasionally garnered comments like 'she has big boobs!' (in that case, from a rather drunk GG Lesbian in a gay nightclub, as we came face to face while I was leaving the ladies room, and she and another GG were entering). The others never get comments that imply they are excessive.
When going out shopping or running errands or just to a restaurant, and intending to blend, I'll usually wear the C-cup forms. They draw less attention and look very natural.
My set that I can wear when swimming or hot tubbing is a D-cup set, but with a curved back, which I think looks better if I am wearing my bikini.
If I am going nightclubbing or dancing, I am more likely to wear the D or DD forms, because then I want to draw more attention my way.
