The body length is measured in a straight line from the highest point of the shoulder at the join of the neck seam to the bottom opening of the sweater.
With arms relaxed down at your sides, measure the fullest part of your chest, all the way around your body from front to back. Keep the measuring tape parallel to the ground.
Bend your elbow 90 degrees and place your hand on your hip. Hold the tape at the top of your shoulder and measure from shoulder to elbow to wrist. The total measurement is your arm length.