We got this for my 5'7" 100 lb daughter. She is very thin and usually wears a size 2 in clothes. We bought a small, and I am glad we did. This bathing suit fit snugly on her torso, and is very loose in the arms(see photos). She has a long torso, but it is not exceptionally long. If we had bought an XS, it would have been too short in the torso. She bought this for a summer camp because she burns easily. She has not worn it yet so I cannot vouch for the durability.
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