Synonyms for Gabardine (same or very similar meaning)
WordNet sense 1 ((usually in the plural) trousers made of flannel or gabardine or tweed or white cloth):
flannel, tweed, whiteWordNet sense 2 (a loose coverall (coat or frock) reaching down to the ankles):
duster, gaberdine, smock, dust coatFrom the ODE community, based on WordNetadd/edit