I only have two colors of work shoes: Black and brown. My work pants are all shades of black or shades of brown. (I’m including khaki as a shade of brown.) Likewise, my belts are either black, or brown. (Sidenote: I have two such belts–one with a gold buckle, the other silver. Each is reversible, with a brown side and a black side.)
But yeah, if there’s any doubt, I will confirm pants color and belt-buckle color with her.