BUST

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.

INSEAM

This is the distance from the uppermost inner part of your thigh to the bottom of your ankle.