I think we are in danger for falling into the trap that the artist may have intended. I do not believe for one second that the attire worn by the gentlemen in this and other like pictures was normal daywear for Scots, even well to do ones. These pictures should be regarded as nothing else than trying to "sell" the romance of Scotland. We can all dig out our Sunday best,or a Dress uniform and pose for a picture, but we all know that is not and never will be, normal wear.
Thanks. That's kind of what I was thinking... and it's why I asked. Personally, I think it looks a little too 'stiff' for normal everyday attire. But it does look impressive!

So, with CMcG's suggestion of specifics, what items in the portrait do you believe would have been normal everyday attire?

Buckle brogues and ghillie brogues: common traditional daywear items, or only "Sunday best"?

What about the horsehair sporrans? Diced hose?

I know these items seem to have fallen out of common use for daywear in our modern era. But I personally see them as 'classic'. I just don't know how 'traditional' they were in the 1800s, in terms of being worn outside formal/military occasions.