Waist / W

Measure the waist straight across, with the pants flat on the ground. Compare this measurement with a pair of pants that fit you well. Take this measurement, double it and convert in to inches to get the international "W" measurements.

Outseam

Measure the outseam with the pants flat on the ground, from the waistband to the bottom of the leg, straight down.

Inseam / L

Measure the inseam, with the pants flat on the ground. From the crotch, measure straight down to the bottom of the leg. Take this measurement in inches to get the international "L" measurement.

Leg opening

Measure the bottom of the leg opening straight across.