Chest Measurement: taken with a deep breath, arms held out at shoulder height. Go directly over shoulder blades on back.
Waist Measurement: taken at natural waistline, on-or-around belly-button
Hip Measurement: taken around the fullest part of the buttocks
Torso Measurement: taken from the center of the shoulder, down the front, through the crotch, and up to the back to the starting point.
Rules of Thumb
Destira leotards run fairly true to size. Most often, a gymnast will wear the same size they wear in street clothes. For growing room, buy one size up.
Metallic fabrics have less stretch and will have a tighter feel when worn. Keep fabric type in mind when choosing size.