How exactly should you measure your sleeve for a shirt order? I know you start from your spinal column, straight across the shoulder/back, and then down the arm. However, some websites/videos state that bend your arm at a 70degree angle, and measure over the elbow, while others say to keep your arm by your side and relaxed. Also, do you stop at the wristbone, heel of hand or the 'V' where thumb and index finger meet? I need a definitive answer. Probably best to ask whoever's going to be making the shirts for you: maybe their methods differ. In any case it might be easier just to measure one of your existing shirts that fits well (you could always add or subtract a bit if none of your present shirts' sleeves are quite right).