I am an avid review reader before I purchase so I'm going to provide as much information as possible to help others make the best choice on size. For reference, I'm 5'6, 160 lbs and a 36D. I ordered 2 large Comfort Shaping Bras with adjustable straps and am glad I got the adjustable straps. I returned one of the larges for a medium and here's my take: I love them both! The large is extremely comfortable but I felt it was a bit too loose even on the tightest hook. The medium was a bit too tight on the loosest hook, so I added the nifty extender, and it feels great! So, it depends on what you are looking for in the fit, but I wear them both. They're extremely comfortable!!