DOWN a size in my experience. I ordered a 1/4 zip top in XL and it was like an XXL. I also had the opportunity to try on on of thier coats at a local retail store that carries some of their stuff, xl was too big also. I wear a 46 jacket. I have the Knab pants in XL and they are pretty big, I wear a 36 waist and they wont stay up without the suspenders.
