XS    S   M   L XL
Waist 11.5" 12.5" 13.5" 14.5" 15.5"
Hip 18" 19" 20" 21" 22"
Rise 13.25" 13.5" 13.75" 14.25" 14.75"
Length 14.5" 14.5" 15" 15.5" 15.5"

*Model is 1.7m, UK 4/6 (Waist 12", Hips 17") and wears size XS.

If you are in between size for waist, it is best recommended to size up. 

*In between sizes refers to your measurements falling between 2 sizes, example size S & M.