The fit is true to size for casual (non-sporting) wear.  I am a 38E/F and the XXL fit comfortably, although for a sports bra the fit was a bit on the loose size -- it was about the same support as a regular bra.  If you want to jump around without bounce this is not the bra for you.

This is the same item as the Mirity sports bra, also for sale on Amazon.  Placing them next to each other, it's clear that they are exactly the same pattern but just using slightly different fabrics.  If you're looking to buy one or the other there is no need to buy both.