O'Neill Sizing
O'Neill Size US Size Bust Cup Waist Hips
XS 0/0 - 1/2 32-33" 32A 23.5-24.5" 34-35"
S 3/4 - 5/6 34-35" 34B 25.5-26.5" 36-37"
M 7/8 - 9/10 36-37" 34C-36B 27.5-28.5" 38-39"
L 11/12 37-38" 36C-38B 29.5-30.5" 40-41"
XL 12/13 38-39" 38B-38C 31.5-32.5" 42-43"
See our complete Lingerie Fitting Guide here.