Not sure if this helps due to the different sizes....
41 Overshirt Leather Yoke in Black / Grey | M -- Curve U Grey | M -- Cast Obsidian | 32
It's bit restricting in the shoulders, but not in a bad way. The 2nd button tugs if buttoned. Neck button impossible to button. I do prefer the fit of this over the Snap Overshirt below.
Snap Overshirt in Linen Grey | L -- Mercer Moon | L -- Cast Obsidian | 32
Went L to button up easier. Aside from that I probably would have gone M. Bulge at elbows, longer arm length than I'd prefer, and boxy drape on the back. Overall a looser and more boxy feel. With a size up it's expected.
Size reference: 5' 11" 190-200 lbs.