Measure your bust around the largest part of your chest and your waist around the slimmest part of your waist.

Size Bust (in) Waist (in)
XS 31 - 35 25 - 28
S 33 - 37 27 - 30
M 35 - 41 29 - 33
L 37 - 44 31 - 36
XL 39 - 46 34 - 39
2X 41 - 48 37 - 42
3X 43 - 50 40 - 46