Waist
For the waist, lay your jeans flat and buttoned. Pull the front waistband upwards so that the top edges of the front and back are even. Measure across the top edge from one side to the other.
Thigh
For the thigh, measure straight across the leg 2″ down from the crotch seam.
Knee
For the knee, measure straight across the leg 12″-14″ down from the crotch seam.
Bottom
For the leg opening, measure across the bottom of the leg at the opening.
Length
Measure along the inseam starting at the the crotch to the finished length.
Patch
To determine the size patch needed, measure the distance across the widest part of the hole and then measure perpendicularly to that measurement.
