I have a few of their vest and jackets. I found they are true to size. If you wear a Large you can buy a large. If your layering I would buy a size or two up depending on how much you want to put on under it. I found they are warm. Depends on where you hunt.
How is the weight on the Pathfinder jackets compared with synthetics (poly-fleece)? Been eyeballing them for a few years but hesitate to pull the trigger when I think about carrying it around in my pack.