(3) Chest: Measure around the fullest part of the chest with the tape measure high up under the arms.
(4) Waist: Measure around the widest part of your waist where the waistband of your trousers normally sit.
Back Length Measurement (for a Waistcoat): Measure from the base of the neck vertically to the base of the waistband.
Find your clothing size: Take your actual body measurements as they are more accurate than measuring over your clothes.