facing
n. C / Un. a layer of material that covers the outside of something to make it look better or stronger. In the military, it can also mean the colorful fabric on the collar or cuffs of a uniform.
n. a layer of material applied to the surface of an object for decorative or protective purposes. In a military context, it refers specifically to the contrasting fabric used on the lapels, cuffs, or collar of a uniform to denote a specific regiment or branch.
The soldier's uniform has red facing on the collar.
The architect chose a stone facing for the building to help it blend in with the historic neighborhood.
While the primary fabric of the tunic was a durable wool, the silk facing on the lapels served as a prestigious marker of the officer's elite status within the cavalry.
Often used in the plural when referring to the decorative parts of a uniform.