1. COLLAR/NECK Measure around the middle of the neck (at adams apple), keeping tape a little loose. 2. CHEST Measure around the fullest part of the chest with a tape measure running loosely under your arms and over the shoulder blades. 3. WAIST Measure around your natural waist keeping the tape measure slightly loose. 4. INSIDE LEG Removing shoes, take measurement along inside leg from the crotch to ankle bone. Alternatively, take measurement from a pair of well fitting trousers.