Really cute one-piece swimsuit with a skirt overlay, hiding the suit's bottom beneath and two little ties on the sides of the hips. Built-in bra with a C cup. There are a few loose stitches on the side seams just above the ties at the hips, and these would be an easy and quick fix. Two buttons on both shoulder straps so that both straps have about an inch of adjustability.
Tagged a size 10 by Maxine of Hollywood but please see measurements: