Source : Webster's Revised Unabridged Dictionary (1913)

Chaparajos \Cha`pa*ra"jos\, n. pl. [Mex. Sp.]
   Overalls of sheepskin or leather, usually open at the back,
   worn, esp. by cowboys, to protect the legs from thorny
   bushes, as in the chaparral; -- called also {chapareras} or
   colloq. {chaps}. [Sp. Amer.]