Oh yeah, what's an Overcoat?
This.The Trenchcoat (infamous of film noir stories and movies) is a waterproof overcoat with an insulated lining. The Lined Coat (Which is a "Duster" similar to those seen in Westerns that's found in SR4A's armour section) is also an Overcoat.
I have a Canadian Army Surplus Greatcoat (From the 1960s, I believe) that's very comfortable and surprisingly wind resistant, but prefer my modern nylon winter coat with insulation due to better pockets on the inside. I also have a Swiss Army Surplus Mountain Greatcoat that I can't even put on unless it's -50 or less outside or else I'll cook in the bloody thing. Finally, I have a Australian-style Duster that's oilsealed brown leather.