Im 53 175 pounds, regular size 8 pants/medium shirts, 38C. I ordered the medium and it fits great! I originally got the peach, but the color was more neon than shown in the picture. It also was see-through so I returned for the black one. The black one aint see through and the style is forever complementary on any body type! I love the long version for elegance. I also bought two short versions of this dress because it is SO cute and SO good looking on me. Just buy it!!