It would be if I had some light tan, dark tan, black, brown, chestnut and ox-blood ones.
I guess if you feel the need to actually have them pre-colored the same as the polish, but the act of polishing tends to do that for you!
I rotate out my undershirts often enough to outpace wearing out the rags I use for shoe polishing. I get 5-6 good rags out of each shirt, and each one works for a couple colors. Just use opposite ends or different spots.