the gentlemen on the right is wearing attire that leans towards the theatrical, with traditional adaptations
Jock, if I may, I'd like to dissect your comment and his attire so that I can better understand where you're coming from. Aside from the old-fashioned waistcoat and the (dreaded) ghillie brogues, what is it about his outfit that leans towards the theatrical? It looks to me like his shirt, tie, Crail jacket, sporran, kilt, hose, and flashes all seem firmly rooted in THCD style. If he were wearing regular brogues and a more modern waistcoat, would there be anything about his attire that strikes you as "too traditional" or theatrical?

As far as context, I believe this is one of the Culloden gatherings, and from other photos I've seen of these events, people are generally dressed in period clothing (though it seems that many take it to the realm of fantasy costume). By comparison, his outfit is pretty tame, though I do agree that it's a bit anachronistic.