What's the noun for Ulsters? Here's the word you're looking for.
ulster
(clothing, men's attire) A long, loose overcoat made of wool or other rough material, often called a greatcoat, which sometimes features an attached shoulder cape covering the back and sleeves, and which can sometimes be buttoned in front.
“Coulson was still a little pale from the effects of his crossing, and he wore a long, thick ulster to conceal the deficiencies of his attire.”
“British gun expert Richard Law has found photographs in which the outline of the big Colt automatic through the fabric of this man's heavy ulster is clearly visible.”
“Da Souza's face was yellower than ever and he wore an ulster buttoned up to his chin.”