This top just arrived this morning and OMG!... The top portion is made of stretch material so no matter what size bust you have, it fits. The buttons are functional. This top is so much better in person...will be posting pics soon. Thanks Chic Star!
I don't know...it looks like the model is just barely getting into it herself and she's probably a B-cup. Cup size does increase to the C/D range with M/L sizes but my experience with big breast in these types of closed back tops it that it's more like trying to shrink wrap two cantaloupes in a very small gift basket.