Meaning

noun a firm durable fabric with a twill weave

noun (usually in the plural) trousers made of flannel or gabardine or tweed or white cloth

noun a loose coverall (coat or frock) reaching down to the ankles

originRecorded since 1904, altering the earlier gaberdine (“long, coarse outer garment”) (since 1520), from Spanish gabardina (perhaps influenced by gabán (“overcoat”) and tabardina (“coarse coat”)), from Middle French galverdine, itself probably from (Old or Middle) High German wallevart (“pilgrimage”), in the sense of “pilgrim's cloak” (from wallen (“to ambulate”) + vart (“journey”)).

Etymology from Wiktionary, CC BY-SA 3.0