Measure underneath your arms at the fullest part of your chest.

Measure at its narrowest point width-wise, usually just above the navel. Keep it parallel to the floor. Do not hold your breath or suck your stomach in. Hold your body upright in a comfortable standing position to get an accurate measurement.

Wrap the tape measure around the fullest part of your hips and butt.

Measure the inside leg (Inner thigh to floor). Use a tape measure to measure the length of your leg from your ankle up to the top of your upper thigh. You should be standing with your legs straight while this is done. Round the number up to the nearest half-inch.