Too tight and too big at the same time.
I'm a 32-a, and i bought a small. i found that the tube portion is pretty tight, but probably needed to keep things up. because there is not a clasp in the front or back, it is really hard to get in and out of. i'd probably be ok with it, but the cups were too big for me. i think i would need to be a c to fill it.
the quality is really nice and the molded cups are a good shape. i wish i could have made it work, because it was really comfortable. i returned it in the end.