Jim Thompson is a Scotch-Irish Texan who carries letters of authority from His Royal Highness Franz, Duke of Bavaria, to serve as an official emissary of the Bavarian royal family, in Texas. I do not understand how it works, but Franz is considered by Jacobites to be the legitimate king of Scotland. For that matter, I am not certain who the Jacobites are. In any event, Franz himself does not claim or even endorse the idea that he is king of anything.
Jim’s uniform, though based on a design that he researched online, is not official. I met Jim at the Scottish Festival in Arlington, Texas.