A very interesting Kilt. Can you take a closer view of the front apron?

In your photo of the apron it appears that just left of center there is a red stripe flanked by light green. But the flanking green bands seem to be different width. Is this an allusion or possibly a fold in the fabric?

I can't tell to well from your description but from looking at the pleats of the Kilt even though it is pleated to the Stripe there are three distinct areas. The center is to the Red Strip flanked by light Green and then outer section is Red Stripe flanked by Blue.

This changing of the stripe you pleat to is the reason for the difference in pleat depth. If you will look at the odd depth pleats you'll probably find that they are at there the color changes.

I really had to take a close look at the Murray of Atholl Thread count on the Scottish Tartans Authority because at first glance I didn't think it was that Tartan.

BTW Murray of Atholl is International Tartan Index no. 281.