I wear 50-52, I took 4XL... Slightly large. In the material there is a natural cotton, in which ratio it is difficult to say. Cloth is dense. Extends, let's see. Recommend. When washing, the shirt gave the shrinkage (sat down)!!! It pleases. First, on me 175-87 (52R.) 4-xl was too big (not critical), secondly, it's a sign of natural material. Recommend.