Fully black mozzettas?

I'm aware that black mozzettas are usually bestowed upon canon chapters. Most of them, however, will use at least ones with purple piping and buttons (some of them with crimson ones, or fully purple mozzettas like those of bishops). I wonder though - are fully black mozzettas used somewhere at all? Perhaps by some particularly modest canon chapter or some such? They're definitely sold from many places, so there must be some degree of demand for them.