trench coattrench coat
a belted raincoat, typically with a folded tab somewhat like an epaulet fastened with a button over each shoulder seam
Origin of trench coatfrom its resemblance to an officer's coat worn in trenches during World War I
A usually long and double-breasted coat having straps on the shoulders, a belt, and deep pockets.
Origin of trench coatFrom the fact that Allied officers wore such coats in the trench warfare of World War I
(plural trench coats)