Summer Stripes: ONE-PIECE RashguardSIZING: This swim set runs true to size and we recommend ordering any 2 piece swim based off of your childs WAIST size and one piece swim based off of your childs pant LENGTH size. **SNAPS ON THE CROTCH UP TO SIZE 3T** Traditionally we recommend NOT sizing up if inbetween sizes if you want the suit to fit snug when wet. Our models are all in their true sizes or a half size DOWN if in between sizes.