The Collaborative International Dictionary of English v.0.48:

Greggoe \Greg"goe\, Grego \Gre"go\, n. [Prob. fr, It. Greco
   Greek, or Sp. Griego, or Pg. Grego.]
   A short jacket or cloak, made of very thick, coarse cloth,
   with a hood attached, worn by the Greeks and others in the
   Levant. [Written also griego.]
   [1913 Webster]