I recently performed my first pleat to stripe for one of our illustrious members of this forum no less. In my research, I found that this method was predominately used in the military because pleating to the stripe is much easier and faster than to the sett, therefore less work to outfit an entire regimen in kilts. After working on one, I see where it is true. There is much less of the beating ones mathematically challenged head on the cutting table while trying to figure out the pleat spacing. The stripes kind of figure it for you.