Well for what it is worth...

I went into town to get some fabric to line the kilt, and also some matching khaki bias tape.

Yesterday I had sewn down the apron facing with a million tiny herringbone stitches that caught a single thread of the apron for each stitch; that was what was originally there as best as I could tell. The part on the stitching caught a few threads, and I put a back stitch into every third or fourth stitch. This lets the folded over facing move just a little in relation to the apron. It also holds down the hair canvas on that side of the apron.

I put some larger herringbone stitches between the back of the apron and the hair canvas on the other side, where the first pleat is, so the hair canvas could have some movement, but be held in place. The first pleat also helps with that, or so it seems.

At the very least, the hair canvas will need to be covered with lining because it extends a little passed what the under apron covers on the left side. I don't know if I will line the whole kilt.

As far as the double reverse pleat on the right side, I can tell that the inside fold of one of the pleats, which is stitched in, is in the wrong place. I mean for it to fit me, I don't think I will remove the stitching, but the pleat wands to have a different fold, so I am going to try to give it that fold. There is another issue, but I am still trying to figure out the cause.

I think I'm pretty close to having the kilt up and running again. It won't fit as well as my wool kilt after I did all of it's alterations, but I don't expect that.