The other day, while brushing down my kilt to put it away, I noticed a vertical thread had come away from the fringed apron edge. It got caught in the brush and had un woven down most of the fringe. I seem to remember this happening once before when I first got the kilt; it's a Stillwater wool. I hadn't worn it for about a year.

What should I do to the fringed edge, if anything?