khaki (n.) Look up khaki at Dictionary.com
"dust-colored cloth," 1857, from Urdu khaki, literally "dusty," from khak "dust," from Persian. First introduced in uniforms of British cavalry in India (the Guide Corps, 1846); widely adopted for camouflage purposes in the Boer Wars (1899-1902). As an adjective from 1863. Related: Khakis.