"A trench coat or trenchcoat is a coat variety made of waterproof heavy-duty cotton gabardine drill, leather, or poplin. It generally has a removable insulated lining, ...
[Read more]
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 before 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, and 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 has straps around the wrists that also buckle (to keep water from running down the forearm when using binoculars in the rain). 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." - (en.wikipedia.org 28.03.2021)
