gaberdine

1. A long, coarse cloak or frock worn especially by Jews during the Middle Ages. Also called gabardine.
2. Chiefly British. A loose smock worn by laborers.
3. See gabardine (sense 1).

[Obsolete French gauvardine, from Old French galvardine, perhaps from Middle High German wallevart, pilgrimage : wallen, to roam (from Old High German wallōn) + vart, journey (from Old High German , from faran, to go).]

The noun has one meaning:

Meaning #1: a loose coverall (coat or frock) reaching down to the ankles
  Synonyms: duster, gabardine, smock, dust coat