The rules of style, handed down at some point by god knows who, are pretty clear on this: you match your leathers and you match your metals. If your shoes are brown, so must your watch strap be. And your belt, your briefcase, your wallet, your chaps, your studded choke collar. Equally, if you plump for a gold wedding ring, you’d best upgrade your jewellery – everything from your watch to your tie bar should match.