My 2 cents:
While not traditional I think the combination of a ruche tie, five button waistcoat, and a Prince Charlie looks smart. There is a pic floating around of Tobus wearing a long tie with a mess style coat [similar to a PC] that looks okay, but it is possible it looks okay because he is a more slender fellow [don't think I could pull off the look being a phat bistid]. With Saxon dress I have often worn a wing collar with long ties, its different. I have also worn Bolos in several combinations. One might also consider a silk or satin mandarin collared shirt without neck wear.

That being said, if you followed Chas's list and Jock's [among others] advice you can't go wrong.
Rondo