I bought the same size I normally wear in other Panache styles (34FF), but this runs maybe a half size larger. The girls are uneven in size, so this is really only evident with the small side. I decided to keep it anyway, because the comfort and support still surpass any other sports bra I've found.

Update: I saw that some reviewers said the bra runs small, but in comparison with other Panache styles, it is larger. Still a great bra. Yes, the girls do jiggle some, but waaaay less than in a regular bra.