Droid;Readers;
Here is another Idea for the frayed edge(which was NaySayed on the list) of the kilt, which I have used-and I still maintain this is what the piper in the Grant painting is wearing-IMHO-. I have taken a lenght of what is now called blanket trim.tape, it can be poly-?? or silk, wool, ect. fold it in half & sew it to the edge of the kilt & up both edges of the aprons. The colour is the other question,match, contrast, blend? I suppose you could use a width of the same tartan, match the pattern, & sew in place-but that would be a good deal of effort & $. On my Filabeg I went with contrast, dark red cotton twill tape on a mostly green,brown & maroon 'hunting' tartan.
Once pinned in place, a simple running stich is all you need: and this method insures that the sewing by the methods proposed, do not snag, pull, or otherwise displace, espc. since the present edge you are repairing, is unstable where you will be sewing.
Whatever you do, let all of us know how the project turns out
As Ever
CSA