S   M   L
PTP
16" 17" 18"
Waist 19" 20" 21"
Hip 20" 21" 22"
Length 44.5" 45" 45.5"

*Model is 1.64m, UK 6 and wears size S

There's allowance at the waist. You may stick to your usual size for a relaxed fit or size down for a slimmer fit.