I wear a 38 D. Got the large, fit well. I wear it around the house as I work from home. There's just not enough support. My fault, guess I should've gotten a lined bra. It pushes my breasts together, then they just hang down, like a uni-boob. Looks terrible and feels weird. I'll keep it but it definitely won't be my first choice out of my dresser.
This bra should be fine for smaller chests, definitely not made for the well-endowed.