I ordered an XL, which is what I use for Robert Graham shirts, which fit fine.
This is WAY TOO Tight around the middle. Much more of a slim fit. AN XL is probably a Medium. a XXL a Large, and a XXXL (if they even have) is what I need.
I'm 5 foot 7, 220 muscular, and too freaking barrel chested to fit in this shirt.