So glad I purchased this jacket. I tried it on in a bike shop and actually bought one but got the best deal with BACKCOUNTRY!!! I could have did a medium but got a large to add extra clothes...and it fits like a large. It's not too big, I have longer arms but it does not look sloppy at all. My thumbs fit comfortably in the slots and adds better coverage with that thumb thing.
It's a flattering length, I'm 5'7 & 1/2 and weigh 140. This jacket kept me warm in 35-40F degree weather with no issues. All I had under it was a base thermal and then the jacket. I have it in the bright blue and red. Great buy!