I wear a 38DDD and I ordered the 38E. The cup size is fine, but the band is entirely too tight--I felt like I was suffocating trying to put this on. However, it's an easy fix with a bra extender, and the structure and lift I got from the bra were both very good, hence the 4 star review. If you're larger than a 34 band I would consider going up 1 band size.