The Collaborative International Dictionary of English v.0.48:

Gabardine \Gab`ar*dine"\, Gaberdine \Gab`er*dine"\, n. [Sp.
   gabardina; cf. It. gavardina, OF. galvardine, calvardine,
   gavardine, galeverdine; perh. akin to Sp. & OF. gaban a sort
   of cloak or coat for rainy weather, F. caban great coat with
   a hood and sleeves, It. gabbano and perh. to E. cabin.]
   A coarse frock or loose upper garment formerly worn by Jews;
   a mean dress. --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gaberdine \Gab`er*dine"\, n.
   See Gabardine.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gaberdine
    n 1: a loose coverall (coat or frock) reaching down to the
         ankles [syn: duster, gaberdine, gabardine, smock,
         dust coat]