The term 'uniform material' refers to fabrics commonly used in the production of uniforms. CHINO, serge, and KHAKI are all examples of uniform materials. CHINO is a lightweight twill fabric usually made from cotton or a blend of cotton and synthetic fibers. Serge is a type of twill fabric with a diagonal ribbing that is often used for military uniforms. KHAKI is a sturdy cotton fabric that is usually dyed in a tan or olive color.