Ready-to-wear men's suit and sport coat sizes are determined by the circumference of the fullest part of the chest, the over arm length and by the circumference of the waist. The chest size, which is the most important measurement in ready-to-wear suits and coats, is measured in inches in U.S. sizing charts. The length of ready-to-wear suits and coats, on the other hand, come in short, regular, long and extra long, which are measurements that are based on a person's height.
In U.S. chest sizing, the different sizes comes in 2-inch increments from 38 to 56 inches. When it comes to suit length, small is made for individuals who stand 5' to 5'7", regular for 5'7 1/2" to 5'11", long for 5'11 1/2" to 6'2 1/2" and extra-long for individuals standing 6'3" and above.
The following shows one method of taking suit and coat measurements for men:
- Over arm
Allow the person's arms to relax on either side of the body, place the tape measure under their armpits, then measure around the fullest part of the chest.
Again with arms resting, measure around the widest part of the shoulders and upper arms.
Determine where the natural crease in the waist is located, then measure around that point with a tape measure to determine the size of the waist.