Source : Webster's Revised Unabridged Dictionary (1913)

Buff \Buff\, a.
   1. Made of buff leather. --Goldsmith.

   2. Of the color of buff.

   {Buff coat}, a close, military outer garment, with short
      sleeves, and laced tightly over the chest, made of buffalo
      skin, or other thick and elastic material, worn by
      soldiers in the 17th century as a defensive covering.

   {Buff jerkin}, originally, a leather waistcoat; afterward,
      one of cloth of a buff color. [Obs.] --Nares.

   {Buff stick} (Mech.), a strip of wood covered with buff
      leather, used in polishing.