Quote Originally Posted by Mr. MacDougall View Post
. What I'm not clear on is why anyone would pleat that way in the first place... I mean, I understand now that it's a traditional style, and it gives more 'swish,' and so on... but why would anyone look at a length of cloth, all those years ago, and think, "Ah! Let's do it this way!"?
I think it is the solution I needed to find, and missed, when I wanted to make a box pleated kilt with more fabric in it.

I progressed from the three layered box pleat, by extending the folds so it was five layers, but I never made the next step of extending the innermost fold over onto the next box, to make seven layers.

The evolution of the military style from a simple box pleated kilt rather than a knife pleat is I think the most likely - and it does seem to provide a 'missing link' for the development of the modern knife pleated kilt from the box pleated.