5'7", 34c, 28 jeans, 4 dress. ordered a small and a medium. never tried on the medium. the small was a little big in the waist, but what threw me for a loop was the chest. huge! could work if it's meant to be blousey, but the armholes were massive. if an xs is returned, i might give it a shot. but i can't imagine what women who are smaller than me are going to do in this jumpsuit. great color, transitions into fall easily. cannot be belted or wear a camisole due to the opening at the stomach. sh