GNU Collaborative International Dictionary of English

Found one definition

1.       
   ‖Chaparajos , 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.]
   Webster 1913 Suppl.