My horse, Sailor, is a very dark bay with black points. I use burgundy tack because that is my favorite color. It doesn't look good on him as he is almost burgundy himself. My friends tease me about even getting a burgundy horse. You would not believe all the stuff I have collected in that color. So much that when I am looking for something, sometimes I can't find it because EVERYTHING is the same color!!!
Anyway, the burgundy looks great on my black horse. I think Sailor looks sharp in black. Sorry, this isn't much help.