M-65 Field jacket.
I have 4 of them, 2 real, 1 Alpha Industries and 1 Rothco.
Do NOT buy any made by Rothco.
Cheap made in Asia junk.
If you can't find real US surplus then Alpha Industries is good.
Real US jackets have plastic zippers, knock offs have metal.
Metal zippers tend to easily jam, haven't had any problems with the plastic ones.