This is the second one I have bought for my father. He wears a medium, I ordered a medium, they sent me a shirt that said medium and it fits him perfectly. He loves both shirts. I bought the XXL for myself and it was too small, size L. Definitely glad they fit him. I only sent mine back because the shirt was too small and didn't fit at all, not because I didn't like it but I liked it. My dad looks good in his too.