I have a friend and his birthday is coming and I'm trying figure out what size does he wear. My friend said get him a XL shirt but I don't know if that's right because he's 6"3 and 200 pounds and the reason why I didn't ask him what his size is because I don't want him to know what I'm up too please help me

Of course shirt size varies with brands, a Walmart may fit different from one in Sears. I would think it would be closer to XXL since he is 6"3' Also if you buy at a better store, make it a long.