Using a measuring tape, measure the smallest part of your waist. Not too snug, not too loose

We measure the seat 3″ above the crotch seam, across the pant. Starting at 3″ above the crotch seam, measure across the pant. Write that number down, then double it (for example, if you measure 20″ across, double it to 40″), for your total seat circumference.

Wrap the tape around the thickest part of your thigh.This is your upper thigh, right under the buttocks. Start the tape at the front of your thigh and wrap it around towards the back before bringing it back to the front. Mark the number at the point where the tape measure meets itself.

The simplest way to measure your inseam is to take a measuring tape and calculate the length between just below your crotch and the bottom of your ankle