Khaki (UK: /ˈkɑːki/, US: /ˈkæki/) is a tan shade with a slight yellow undertone. Many militaries around the world have used khaki for uniforms and equipment, particularly in arid or desert regions where it provides camouflage in sandy or dusty terrain. It has been used as a color name in English since 1848, when it was first introduced as a military uniform. In Western fashion, it is a standard color for smart civilian casual pants, often referred to as khakis. In British English and other Commonwealth usages, khaki can also refer to a shade of green known in the United States as olive green.