We begin by buttonning up the jeans. We then lay the jeans flat with the top waist band evenly flat on the back. We measure from one side to the other keeping the jean flat & double the measurement.
Lay flat and measure from crotch seam to top of jean with top button fastened.
The thigh is measured 1" below the crotch straight to the outside of the leg.
After we lay flat and measure 14" from crotch down inside seam of jean. From here measure from one side of the jean to the other.
With the jean flat, measure from one side of the leg opening to the other.
Then we measure from crotch seam to top of the back of the jean.