I have 6'1 and 175 or so. I typically have a 42" chest and a 32" waist with a sleeve length of about 34-35". I usually wear a 16.5 x 34 shirt. I've lost some weight lately and wanted a tight shirt . This shirt is about 16.5-17 inches in the following size. Chest 42 is ideal if you like a tight fit. Sleeves 34-35. The material resembles soft cotton and is suitable for a casual shirt. The collar design makes it close a casual shirt. You can get away with this in some business situations, but don't confuse it with a dress shirt. It's very flattering for my height. Accentuates the shoulders and my small waist. I like it.