im 5'8" 172lbs lean, 34 waist, 40.4" chest....
im 5'8" 172lbs lean, 34 waist, 40.4" chest. i was thinking a medium, ill probably occasionally wear a fleece or wool sweater underneath. or should i get a large?
I think medium should probably do it for you. Definitely the right size, not sure how it would accommodate a mid-layer underneath though. If you want to play it safe, and don't mind a slightly looser fit go large.