exceptions to tradition: the Queen

[Mike_Oettle]

A question from my wife last night brought back to mind an aspect of kilt lore that I had almost forgotten.
I mentioned a point made by Jock Scot that in the Highlands, wearing a kilt with underwear rendered the kilt a mere skirt (improper wear for men).
And she asked: what about the tradition that an exception is made when a Queen is on the throne?
Now when I was with my regiment, some mention was made of such an exception, but nobody paid much attention to it. I never did quite figure out whether that was because it was a non-existent exception or because we no longer had a Queen (South Africa having been a republic for close on a decade when I first joined the regiment.)
In other words, was this an actual part of tradition, or something apocryphal, like the unwritten law that a sgian dubh has to draw blood before being sheathed?
So would Jock or some other knowledgeable Scot enlighten us: Is there any truth at all in the belief that the presence of a Queen Regnant on the throne would make any difference to the tradition?
My feeling is that it would not, but I would like to satisfy my wife with an authoritative answer.
Regards,
Mike