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.

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.

INSEAM

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