I tried on both the medium and large. I am 5'2" and 135 lbs, medium build, 36b bra size. The large gaped in the chest. The medium is tight in the chest. Dress is too low cut for a traditional bra, but doesn't look trashy. The fabric is heavy and sophisticated. Overall beautiful dress, but fits very specifically. I used the try before you buy which was a godsend considering the price and allowed me to try both sizes.