I'd probably put you in the XXL. It's a pretty generously sized coat, so depending on how big or small your upper body is, you may be able to fit into the XL.

I'm 5"7, 150. I'd say BC/DF's listed sizes for the Hemp Hoodlamb Classic are misleading. I normally wear a jacket in large, which is my size. The Hoodlamb is generously cut. It feels right in medium, just a perfect fit. If I wanted it baggier and looser fitting, I would go up a size to large. With this brand, wear it one size down from your usual jacket size.