How to Measure a Shirt: Cuff Around
Unbutton the shirt cuff and spread the cuff out flat. Be sure to unbutton the sleeve placket (also known as the gauntlet) button to aid in spreading out the cuff fully. Place one end of the measuring tape at the center of the button where the button stitching comes through to the inside of the cuff. Measure straight across from the center of the button to the outside edge of the button hole.