Personally I dislike black suits, and most black clothing in general. Nothing darker than charcoal grey for me, thanks. I only own one pair of black shoes, and one black belt, which are only worn on formal occasions.
If it is a black suit, and you are trying to pull it off with brown shoes or a brown belt, or a brown watch for that matter, then no. No, no! NO! If it is something less formal, like jeans, or even a lighter colored suit, then I suppose it is acceptable. By formal, I mean business meeting, job interview, a big presentation. Black suit, black shoes, NO BROWN.
I never liked black suits; wore dark blue. grey and/or brown. Black shoes with dark blue and dark grey. Dark brown shoes with some blues, most greys and, of course, brown. Never black shoes with brown clothes. And only real brown, darker not tan.