Having just about finished by first knife-pleated kilt and awaiting the fabric for my second (the X-Marks tartan!), I have a question about box pleating. Before I sit and try to figure it all out on my own, I figured I'd ask here first so I don't re-invent the wheel. Is there a special mathmatical formula or process to determine the number of pleats? To my thinking, and I'm probably off, the number of pleats are the same, but every other one is sort of turned "inside out", so there's the illusion of half the number.

Am I on the right track or totally off?