I'm 5'9" 175lbs. Ordered a large and a medium to compare. The large was tight. The medium was very tight. I'd advise sizing up, and you'll still get the slim fit. I liked the look of the large. I'm sure the XL would still fit nicely with a little more space. :) I DID NOT LIKE the lilac color. It was basically a dishwater grey. Too blah for me. The poppy blue was nice. A great layering piece. Light on its own, but able to be worn under a vest or jacket. Looking forward to getting my size right. <3