A trenchcoat, or trench coat, is a raincoat made of waterproof, heavy-duty cotton gabardine drill or poplin, or leather. It generally has removable insulated lining, ragline sleeves, and the classic versions come from above the knee to meeting at the mid-calves. The garment traditionally is double-breasted with ten buttons, has wide lapels, a storm flap, and pockets that close.
They were initially used during World War I by Great Britain and France as a replacement to the heavy siege greatcoats in the same war.
Warning: The following information is from outside Hideo Kojima's core "Metal Gear Saga." It has some level of canonicity within the continuity, but reader discretion is advised.[?]
Gene, while leading FOX during this time, wore a trenchcoat, as did Soviet Colonel Skowronski.
Big Boss wore a trenchcoat with his suit during his time as commander of FOXHOUND and in 2014.
All members of FOXHOUND wore long trenchcoats with seven buttons and padded shoulders when Liquid Snake became the group's squad leader. Ocelot also wore a trenchcoat in 1984 and during the Tanker Incident in 2007, the latter time also resulting in some damage due to Ocelot discarding his coat in front of his compatriot, Sergei Gurlukovich, and then firing on him just as the latter tried to shoot him, causing bullet damage.
AbbyShot Clothiers, a company that creates movie and video game-inspired clothing, created two versions of the FOXHOUND trenchcoat: the standard coat, priced at $399 CAD ($385 USD), and a custom sized version priced at $499 CAD ($482 USD), both based on it's dark brown appearance in The Twin Snakes.