Going back to your original questions Woodshiel;

I'd think kilts may have died out quite rapidly after the '45.
To wear one after that time, could mark a man as a "Highland rebel" ...even if he'd never been 'out'.
So, If a man Was a jackobite, he'd have a vested interest in concealing the fact, and if he Wasn't he'd not want to be implicted by dressing like one.
Makes sense to me, even if I'm wrong!

The very good question you ask has had me thinking, and Charles St John's book, "A tour of Southerland" has I believe some reference to 'Highland laddies' wearing the kilt in his time.
Also, If I remember right, Osgood Mackenzie in his book "A Hundred Years in the Highlands" makes reference to the kilt as well.
I must go back and check these references out.