Trench coat

A trench coat or trenchcoat is a raincoat made of waterproof heavy-duty cotton gabardine drill, or leather, or poplin. It generally has a removable insulated lining, raglan sleeves, and the classic versions come in various lengths ranging from just above the ankles (the longest) to above the knee (the shortest). It was originally an item of clothing for Army officers (developed prior to the war but adapted for use in the trenches of the First World War, hence its name) and shows this influence in its styling.

Traditionally this garment is double-breasted with 10 front buttons, has wide lapels, a storm flap and pockets that button-close. The coat is belted at the waist with a self-belt, as well as having straps around the wrists that also buckle. The coat often has shoulder straps that button-close; those were a functional feature in a military context. The traditional color of a trench coat was khaki, although newer versions come in many colors.

https://en.wikipedia.org/wiki/Trench_coat