Measure around your chest at the fullest point of your bra cup.
Measure around the smallest part of your waistline with one finger between your body and the measuring tape.
Stand with your heels together, keeping tape straight and parallel to the floor. Measure around the fullest part of your hips.
Find a pair of pants that fit you well and measure from the top of the waistband to the crotch to compare measurements.
Find a pair of pants that fit you well and measure from the crotch to the bottom hem.