I wear a size 4-6 in jeans and am 5'6'' tall. I ordered the Large originally, only because I liked the way the black one fit in the picture better than the turquoise one on the girl because I didn't want it to fit too tight around my waist (I'm really self confident about not getting a swim suit too tight to show the little "rolls". Anyways, WAYY too big and I returned it for the medium and actually could have taken the small. I love it though.

Exactly what I was looking for. I wanted a rash guard, swim cover up and work out shirt all in one that wasnt too tight. This shirt fits the bill.