I really think you are on to something here Alan. I had not heard of the box pleat either until I joined x-marks, I was under the often repeated myth that the knife pleated 8 yard kilt was the only traditional one. Now I am also waiting patiently for a Matt Newsome 4 yard box pleated kilt.
If you google Box pleat kilt the first thing you find is Matt's site however not far down the line you find x-marks. I think we must be doing something right. Yes I think we may have helped just a little in getting the box pleat specifically and the kilt in general, more widely accepted just in being here and choosing to wear the kilt out in public.