I'm 5'8" and i have a full brown saga suit in large, and a full blue saga suit in large. I'm entertaining the idea of trading both of my large jackets for your medium jackets in their respective colors. Ideally, i would like to at least try one on. It seems like i'm just swimming in my jacket the whole time, which isn't bad, but i would prefer a wee bit smaller size, i think. The scuba blue jacket i have has maybe 10 days on it and is like new. The brown jacket has been used one day, and for all intensive purposes, is brand new. To make this trade, your jackets must be in like new or new condition and no smells, stains, etc. Both of my jackets look like they were just taken out of their packaging. Let me know, i thought i would give it a shot.