Yes Gilbert had a talent for demonstrating the topsy turvey paradoxes in his plots.

But there is no indication whatsoever that Major General Stanley has any Scottish connections and he is a "descendant by purchase" of Cornish ancestors and you cannot get any further away from Scotland on the UK mainland than Cornwall!

Even the Cornish tartans are somewhat more recent than the 19th Century!

I know there can be a fashion for dressing productions up in costumes that are far removed from the original but at least when they do this they are consistent in their style. I take it there there is no similar costume for Frederick or for the Pirate King.