I bought XL because I like a little room in my shirts and like the extra length. The body of the shirt fit fine. Maybe a little bigger than usual but the sleeves were tight around my arms. I’m not a big guy, not fat nor do I have muscular arms. A big guy is going to have big arms so I don’t know why they would make the sleeves on an XL fit like it’s a medium. I’m talking actually tight in the arms. It also looked ridiculous. Glad they were try before you buy. Sending back.