I am 5' 11", size 10 and run around a 36C, Bras have been making me absolutely nuts, rubbing my skin raw around the base. And the latch and the back drives me nuts.  I'm getting completely neurotic about uncomfortable bras.  I love the seamless bras, however I prefer not to point at people through t-shirts so a padded bra is very necessary.  I purchased a large and it fits comfortably.  Very comfortably, while I would not use it as a sports bra, it has sufficient support and doesn't have annoying top jiggle over.  I can not see the pad in a fitted t-shirt, so I am very happy, I plan to order a few more right now.