Just trolling through kilt stuff, as you do, and came upon this snippet. The modern kilt was invented by an English Lancastrian.

"A letter published in the Scots Journal in March 1785 argued that the garment people would today recognize as a kilt was invented around the 1720s by Thomas Rawlinson, a Quaker from Lancashire. Rawlinson is claimed to have designed it for the Highlanders who worked in his new charcoal production facility in the woods of northern Scotland. After the Jacobite campaign of 1715 the government was "opening" the Highlands to outside exploitation and Rawlinson was one of the businessmen who took advantage of the situation. He thought that the traditional Highland kilt, the "belted plaid" which consisted of a large cloak, was inconvenient for tree cutters and introduced the new kilt. Rawlinson liked the new creation so much that he began to wear it as well and was soon imitated by his Scottish colleagues, the MacDonell's of Glengarry."

No wonder I had the urge to get one!!
Still awaiting delivery of an 8 yard Heritage of Wales Cilt.
It gets better, a Welshman wearing a Scottish style kilt invented by an Englishman!! Now we just need to figure how to include the Irish.