The Collaborative International Dictionary of English v.0.48:

Garibaldi \Ga`ri*bal"di\, n.
   1. A jacket worn by women; -- so called from its resemblance
      in shape to the red shirt worn by the Italians patriot
      Garibaldi.
      [1913 Webster]

   2. (Zool.) A California market fish (Pomancentrus
      rubicundus) of a deep scarlet color.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Garibaldi
    n 1: Italian patriot whose conquest of Sicily and Naples led to
         the formation of the Italian state (1807-1882) [syn:
         Garibaldi, Giuseppe Garibaldi]
    2: a loose high-necked blouse with long sleeves; styled after
       the red flannel shirts worn by Garibaldi's soldiers