20 inch neck. Wow. How tall are you if you don't mind me asking? -LR no worries, 180 cm = 5'9'', shoulder to shoulder 55 cm = 1'8'' not a small frame, which might explain my preference for more solid footwear than most here. the 20 inch are measured recently, so the collar will be 21 for an initial order at a new shirtmaker.