Measure a shirt with a collar that fits you well. Open the shirt and lay the collar flat. Measure from the center of the collar button to the far end of the button hole. The measurement in inches is your collar size. (Alternatively, measure around the base of your neck, inserting a finger or two between the tape and your neck to allow for comfort.)

With arms relaxed at your sides, measure around your chest at the armpits, over the highest part of your chest and shoulder blades, keeping the tape parallel to the floor.

Bend your elbow 90 degrees and place your hand on your hip. Hold the tape at the center back of your neck. With a friend's help, measure across your shoulder to your elbow, and down to your wrist. The total length in inches is your sleeve length.

Measure around your chest including the fullest part of your arms at the highest point of your shoulder blades, keeping the tape parallel to the floor. If this measurement is 7 or more inches larger than your chest measurement, order the next larger size sportcoat to avoid binding in the upper arm and shoulder area.

Stand in stocking feet with your feet slightly apart and your back to a wall. Measure from the floor to the top of your head.

Regular describes a well-proportioned body 5'8" — 6'0" tall, with hips and chest of equal girth.