Measure just under arms and across shoulder blades holding the tape firm and level. If your chest falls between sizes, order the next size up.
Bend side to side and find the natural bend in your body; this is your natural waist. Note: It may not be the smallest point.
Measure the fullest point between your natural waist and crotch.
Measure from your crotch to the desired length on body. You may also measure pants that you currently own and like. Lay the garment flat and smooth out. Measure on the front from the crotch point along the seam to the hem for the inseam length.
It is best to have someone take the measurements for you, measuring over undergarments only.