Dressing down the Brian Boru/PC

[CMcG]

<snip>
Can or should one dress down the formal attire using a Brian Boru or PC jacket? <snip>

Yes you can. As an example, I'm including a photo of Gerard Butler doing just what you ask on the red carpet for some event or other. I think he could have gone even further and ditched the three button waistcoat for a nice, big, shiny, belt buckle. This falls under breaking fashion "rules" in favor of style.

Whether or not you should do such a thing is another story. It certainly would not follow convention and the kilt police might arrest you! As others have mentioned an argyll is much more flexible for dressing up or down and remaining within established mores.