"i'm 5'6", 120lbs, 36b and i purchased this in the medium. i go back and forth between smalls and mediums in free people and i was glad to have sized up with this tee. it fits perfectly, plus i figured that it will shrink up a little bit in the dryer. you definitely have to wear a backless bra with this though, the only bummer. the black with the purple and the contrasting gray back are adorble and of course, i love the cut out back! the material is so soft. great buy to dress up or down!"