Guide I use to measure
Lay flat. Do not stretch or pull fabric.
Waist: Measure the inside of the back waistband from one side to the other.
Hips: Measure across the base of the zipper from edge to edge.
Rise: Measure from the inseam to the top of the front waistband.
Inseam: Measure from the crotch seam to the bottom of the ankle.
Leg Opening: Measure across the leg opening from side to side.