Surtout

(n.) A man's coat to be worn over his other garments; an overcoat, especially when long, and fitting closely like a body coat.

Thesaurus Entries

Inverness, benjamin, capote, chesterfield, cloth coat, coat, dreadnought, duster, fur-lined coat, fur-trimmed coat, greatcoat, jacket, long coat, mac, mackintosh, paletot, raglan, raincoat, slicker, surtout, tarpaulin, topcoat, trench coat, ulster, waterproof, wrap-around