Measure around the fullest part of the chest, ensure the tape is under the arms and arms are straight.
Measure your waist at your narrowest part (natural waistline).
Measure around the fullest part of your hips - standing with feet together.
Bend elbow slightly. Measure from center of the base of neck, across the shoulder, down arm to elbow, finishing at wrist.
Measured from crotch to ground (shoes off).