I got the s/m and it fits pretty great. I would say it is a tad tight in the arm pit area but nothing to extreme. I’m still able to layer under it and move around comfortably. I’m 6’1” and 135. I would say the l/xl would probably fit you pretty well. Have you seen just the regular rain parka? It seems like a great piece to throw over your outfit if you’re just looking for a water resistant jacket rather than a touch of warmth.