To start, I’m 6’1, about 190 lbs, and have an athletic build….I ordered a Medium. This is the best quality piece of clothing I’ve ever purchased. From $300 dress shirts to $1,000 suits, I’ve never been as impressed with something out of the package as this shirt/jacket. It’s heavy, warm, fits so good even my wife commented on the taper. For those my body size that like things “fitted” not tight, Medium is it. For people who prefer something on the looser side, size up. The color is great and vivid. Just buy it.