S M L
PTP 16" 17" 18"
Length 21" 21.5" 22"

*Model is 1.73m, UK 4/6 (PTP 15.5", Waist 12") wears size S.

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

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