Sizing refers to body measurements, not garment dimensions
How to measure:
Neck: Around the fullest part of the neck, at the base
Bust: Around the apex of the bust, just under the arms and across the shoulder blades
Sleeve: From the center back of the neck, across the shoulder, and down the arm to the wrist
Waist: Around the narrowest part of the waist
Hip: Around the widest point of the hips
Inseam: From the crotch to the ankle bone on the inside of the leg