I'm a big fan of the argyll with waistcost for black tie events. To me it's a better equivalent of the American black tie tuxedo than a PC (which always seemed like a white tails equivalent.) Nothing overstated. James Bond from the waist up and Sean Connery from the waist down.

You could go the diced hose route if you wish, but it's something that's likely to draw more attention. You may or may not want to be conspicuous on this occassion.