This seems like an outfit that was invented because the Scottish were too drunk to figure out how to make or put on clothes so just used a blanket
Like i said, It is easy to take textiles for granted in the modern world. But, Prior to the industrial revolution (Which was much more about textiles than Steel really) Textiles would be
Very expensive indeed!
I have no doubt
at all that people would use clothing as bedding and vice-versa!
And the idea of cutting up a very expensive piece of cloth, wasting half of it, to make tailored clothing would only be something that the stupidly wealthy would ever consider.
Everyone has that one friend/acquaintance who thinks having a Scottish great grandfather or something means they should attend all weddings/functions in a kilt.
I am not claiming Scottish heritage as such (Though, having a very unusual name does mean I have been able to do the genealogy thing back to Kelso in the Norman era

)
Just that I think, on balance, I think Kilts might well be very practical and comfortable clothing.
What I would be wanting, mostly, is actually a working Kilt/outfit. For when I do gardening, car repairs, whatever!
"Formal" Kilts/outfits are all well and good, but I would not want to walk into the local Supermarket wearing one any more than I would want to do so wearing a white tie and tails!