From my past experience with Craghopper/Bear Grylls Clothing. They go by European sizing. I normally wear a Large, but I fit in XL for this company. I’m 6’2 and 200lbs. Great deal for a down jacket, plus they have a lifetime warranty.
Sizing is a bit wonky on this one, sleeves are a bit short for Large but the torso is more XL than Large on the XL. Also the pile on this sweater is much flatter than in pictures.