From book cited in OP, on Friday, 8th October, Boswell writes of the people of Col:

They can all dye. Heath is used for yellow; and for red, a moss which grows on stones. They make broad-cloth, and tartan, and linen, of their own wool and flax, sufficient for their own use; as also stockings. Their bonnets come from the main land. (324)

That might be interesting to the reenactment folks.

I had to take an excursion into reading up on Scottish horses because he discusses the horses of the island, a little earlier in the entry, without naming the breed. Apparently they did not shoe their horses on Col.

Then after traveling to Sky on, Sunday, 12th September, he writes:

I was highly pleased to see Dr. Johnson safely arrived at Kingsburgh, and received by the hospitable Mr. Macdonald, who, with a most respectful attention, supported him into the house. Kingsburgh was completely the figure of a gallant Highlander,--exhibiting 'the graceful mien and manly looks,' which our popular Scotch song has justly attributed to that character. He had his Tartan plaid thrown about him, a large blue bonnet with a knot of black ribband
like a cockade, a brown short coat of a kind of duffil, a Tartan waistoat with gold buttons and gold button-holes, a bluish philibeg, and Tartan hose.
He had jet black hair tied behind, and was a large stately man, with a steady sensible countenance. (244)
Once again, the kilt is not described as tartan. The hose are, in this and the other quote, specifically described as tartan. The "plaid" is also described as tartan etc, but not the kilt. Why would the kilt not be described as tartan if all these other items are described as tartan, unless the kilt were not tartan? Just saying...

I also note the long hair tied back.