Argyll waistcoat with PC jacket

[Karl R]

So, is there any serious reason that 5 button waistcoats shouldn’t be worn with PC jackets? Asides from tradition.

Various companies sell 5 button Prince Charlie waistcoats, so I assume it's a thing. I've also seen a number of photos of people wearing them.

I believe (though I'm not 100% certain) that a 5 button Prince Charlie waistcoat is cut shorter than the traditional 5 button Argyll waistcoat, since they're intended to be worn with the shorter Prince Charlie jacket.