Measurements are in inches and refer to body size for all brands.
For best results, measurements should be taken over your undergarments.

NECK:  Measure at the base or the fullest part of the neck.
CHEST/BUST:  Measure around the fullest part, just under arms and across shoulder blades.
WAIST:  Measure loosely around waist at the height you prefer to wear waistband.
HIPS:  Stand, feet together, and measure around the largest circumference at hips.
ARMS (SLEEVE LENGTH):  With elbow bent, measure from center (back) of neck to elbows and down to wrist.
BODY LENGTH:  Measure from the highest point of the shoulder to the lower hip.
Threadfellows Sizing