New TOMBOYX Keyhole Bralette size S. NO tags Use chest measurement (at fullest point) to determine size. XXS=32-33", S=34-35", M=36-37", L=38.5-40", XL=41.5-43.5", 2X=44-46", 3X=48-50", 4X=52-54". Slips on over head Scoop neck Elastic bust band Lined 95% micromodal, 5% spandex Machine wash, tumble dry