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 34-38 24-26
XS 34-38 26-28
S 37-41 28-30
M 39-43 30-32
L 41-45 32-34
XL 43-47 34-36
2X 45-49 36-39
3X 47-51 39-42
4X 49-53 41-44