Lay jeans flat and buttoned. Align front of waistband with back as much as possible. Measure from end to end, then multiply this number by two.
Measure across leg 1" down from crotch.
Measure from center front of waistband down to crotch seam.
Measure from center back of waistband down to crotch seam.
Measure across leg 14" down from crotch.
Measure across bottom of opening.
Measure from crotch down to the end of the leg