This whole thread does make me wonder why Prince Charlies are nearly always sold and worn with a waistcoat, while at least around here Tuxedos are usually worn with a cummerbund instead.

Back in the 80's and early 90's when I was piping at a lot more weddings than I do now I actually went out an bought a nice matching cummerbund and bow tie set in black.

I did this because nearly all the weddings had the men in black Tuxedos and black bow ties and cummerbunds, and to wear waistcoat would make me clash.

I discovered that the best-matching thing was white Churchill/wing collar shirt, black bow tie and cummerbund, and black Argyll/Braemar/Crail jacket. I wore the cummerbund instead of waistcoat with my Prince Charlie as well.

I haven't done that for many years! For the last few years it's been charcoal grey hose and matching shirt with black long tie and black Argyll jacket, which is fairly neutral and unobjectionable.