I am 5'11'' and weight between 182-185 and the casual long sleeve goldbutton shirt fits well. I ordered size large in Asian size and medium in USA size. I wear slim and fitted clothing and this shirt is perfect. It is made part spendex and cotton so it will fit close to the body size. If you don't like to wear shirts close to the body fitted size I advise to get a one larger size for a little loose fitting.