Stutterheim coats? - Page 2
This is always subjective, but I'll add my two cents since I have similar dimensions - I'm 5'8", about 172, 41 chest, 33 waist. I went with a small Stockholm after first trying on a medium that was a bit too roomy for me. The cut is modern and slim, but not aggressively so. I typically wear an undershirt, a button down, and some kind of light sweater underneath. I like my stuff to look tailored, but never tight -- I'm hyper-sensitive to looking like a stuffed-sausage in my clothing, particularly as I age. The small fits the bill for me. NMWA carries these and has a very customer friendly return policy, so you can try for yourself without any risk. The pop-up on Lafayette may also still be open if you find yourself in NYC. Good luck.
fwiw I am 5'9" 175lbs and the halloween pic above is me with an M. the shoulders are right. and it has room for a knit/very thin down jacket etc. if you care to wear it in winter.
(if you get it from us (or any other store that has free shipping and returns), you can always get both and only keep the one you prefer...)