I had posted earlier asking about sizing in topcoats, then decided I didn't like the tan Hickey that I was looking at on eBay at the time, and STP has several cashmere topcoats right now. What are the feelings between black and navy for a topcoat? Black seems to be better with a tux, but I don't wear a tux enough to justify a separate topcoat. Is a black topcoat OK with a navy suit? Or is a navy topcoat OK with a tux? Or how about black heather?