I purchased one medium and one large bra because I didn't know what size I would be post-breast reduction. I don't really know what size I was before surgery because I could only fit into one kind of stretchy cup bra size 38DD (the closest that would fit me in stores and I was still pouring out of it). If I had to venture a guess, I'd say I was a 36E or larger. Now, I'm a 36D. These bras have adjustable straps as well as front closure. Both were comfortable (as possible I guess) after surgery. There were of course places that rubbed and were sore but far better than even the genie bra or ahhh bra that I tried a few weeks after surgery. It is well made and very supportive/strong.