I'm 5' 3", 115 pounds, and bought the xs in white. i actually wear this as a bathing suit cover-up instead of a top. i love that it's little longer in the back so it covers part of the back of my thighs. it's light weight, cool and comfortable. it is thin but has washed well with no pilling or holes so far. i've worn this several times and have had lots of compliments.