khaki

Concise Oxford English Dictionary © 2008 Oxford University Press:
khaki /ˈkɑːki/

▶noun (pl. khakis)

• 1 a cotton or wool fabric of a dull brownish-yellow colour, used especially in military clothing.

  ■ (khakis) clothing made of khaki.

• 2 a dull greenish or brownish-yellow colour.

– origin C19: from Urdu khākī ‘dust-coloured’, from khāk ‘dust’, from Pers.