Here's a question for the 'experts' that popped into my mind, and it's more or less related the original topic of this thread!;

We have been talking about Scottish armigers, and how the feather is one of their traditional identifying symbols, displays etc..
Suppose somebody is not of Scots heritage, and/or holds arms granted from someplace outside of Scotland, say the College of Arms in England, the Chief Herald in Ireland, or South Africa etc..
And suppose this fellow wanted to sport Highland dress? Theoretically, what sorts of display(s) would be appropriate or not? and would it depend on where he was?