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When taking these measurements, use a cloth tape measure, not a metal one. Make sure that, when you circle your chest, waist, or hips, the tape is level and neither too tight nor too loose. Also measure yourself on your bare skin, not over clothes. And this may sound silly, but don’t trust your memory — be sure to write the measurements down!

CHEST: Measure the circumference of your chest. Place one end of the tape measure at the fullest part of your bust, wrap it around (under your armpits, around your shoulder blades, and back to the front) to get the measurement.

WAIST: Measure the circumference of your waist. Use the tape to circle your waist (sort of like a belt would) at your natural waistline, which is located above your belly button and below your rib cage. (If you bend to the side, the crease that forms is your natural waistline.) Don’t suck in your stomach, or you’ll get a false measurement. If you generally wear your clothes below your waist, take that measurement as well.

HIPS: Measure the circumference of your hips. Start at one hip and wrap the tape measure around your rear, around the other hip, and back to where you started. Make sure the tape is over the largest part of your buttocks. Because making sure the tape is level back there can be hard, try to do it in front of a mirror.

UPPER ARM: Measure the circumference of your arm. Wrap the tape measure around the widest part of your upper arm from front to back and around to the start point.