Measure your hip around the widest part of your hip and your waist around the slimmest part of your waist.

Size Hip (in) Waist (in)
XXS 31-35 24-26
XS 34-38 26-28
S 37-41 28-30
M 39-43 30-32
L 40-44 31-33
XL 41-45 32-34
2X 42-46 33-35
3X 43-47 34-36
4X 45-49 36-39