As Geoduck said you have to find that out from a men's shop. I know my size, even though it has been years since I have bought a suit, because I looked into one of my old suit jackets and it said long. I bought both my Prince Charlie and Argyll in long. I also knew I was a long before getting measured because I am 6'4" and 320lbs, and I usually have to get the largest size available to get anything to fit.