noun / adjective
khaki
KAH-kee/kˈɑki/
A sturdy tan cloth woven in a twill pattern.
The folded khaki has a dull yellowish-brown color and sturdy cotton weave.

Etymology
Urdu khaki means “dusty,” referring to the color of dust. English first used it for dust-colored cloth, then for the dull yellowish-brown color itself.
In context
tan trousers and the black police tunic or maybe a khaki tan police army tunic and black police trousers