The Collaborative International Dictionary of English v.0.48:

Buckskin \Buck"skin`\, n.
   1. The skin of a buck.
      [1913 Webster]

   2. A soft strong leather, usually yellowish or grayish in
      color, made of deerskin.
      [1913 Webster]

   3. A person clothed in buckskin, particularly an American
      soldier of the Revolutionary war.
      [1913 Webster]

            Cornwallis fought as lang's he dought,
            An' did the buckskins claw, man.      --Burns.
      [1913 Webster]

   4. pl. Breeches made of buckskin.
      [1913 Webster]

            I have alluded to his buckskin.       --Thackeray.
      [1913 Webster]

WordNet (r) 3.0 (2006):

buckskin
    n 1: horse of a light yellowish dun color with dark mane and
         tail
    2: a soft yellowish suede leather originally from deerskin but
       now usually from sheepskin