Alas, the discontinued Boyt Harness HU1100 Field Coat, sometimes found for a big discount on the Internet.
All these are nice when sized loose enough to hang well but still wear over a heavy wool shirt or a light sweater:
Filson Weekender - really nice, heavy brass zippers, supple, not for downpours, but more than water resistant
Orvis Heritage Field Coat - old school design. Reviews say it is not as good as it once was, but I only know the original
Beretta Forest Jacket - light and really well made. I don't have this one. I have the heavy model, which is toasty warm