XS  S  M L
PTP 15" 16" 17" 18"
Waist 12" 13" 14" 15"
Center Length 13.5" 14" 14.5" 15"
Length 15" 15.5" 16" 16.5"

*Model is 1.68m, UK 6 (PTP 15.5", Waist 12.5") and wears size S.

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

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