The Collaborative International Dictionary of English v.0.48:

Brigandine \Brig"an*dine\, n. [F. brigandine (cf. It.
   brigantina), fr. OF. brigant. See Brigand.]
   A coast of armor for the body, consisting of scales or
   plates, sometimes overlapping each other, generally of metal,
   and sewed to linen or other material. It was worn in the
   Middle Ages. [Written also brigantine.] --Jer. xlvi. 4.
   [1913 Webster]

         Then put on all thy gorgeous arms, thy helmet,
         And brigandine of brass.                 --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

brigandine
    n 1: a medieval coat of chain mail consisting of metal rings
         sewn onto leather or cloth

Easton's 1897 Bible Dictionary:

Brigandine
   (Jer. 46:4; 51:3), an obsolete English word denoting a scale
   coat of armour, or habergeon, worn by light-armed "brigands."
   The Revised Version has "coat of mail."