I'm a 36 B/C. Size Large fit perfectly and was very comfortable although more compression across the front would have made it a better sports bra. Jiggle was minimized but not eliminated.
A 36 A/B woman might find the fit too loose in front. A 36 C/D woman probably wouldn't get enough support.
What makes the bra work for me is the wide coverage around and over the top of the shoulder. A recent shoulder tear has made conventional bra straps unbearable. Even though this may not be the perfect riding bra, it is a workable compromise of comfort versus support.
Note: I bought a Medium at the same time since the review comments didn't match the sizing chart recommendations. The chest band was significantly smaller than on the Large. There was no way I could have gotten it on.
Conclusion: A little more elasticity in the front part of the bra would have given it a better range fit and better support. With that said, if you are lucky enough to be within the fit range, it is a comfortable, useful bra.