I've also got a nice comparison picture on the Scottish Tartans Museum gift shop page that shows two kilts, side by side, both in the same tartan, both pleated to the same stripe, one a 4-yd box pleat, and one an 8-yd knife pleat.

http://giftshop.scottishtartans.org/kiltpage.html

It's the Moffat tartan, by the way. That's my butt on the left, and the larger rear end on the right is my partner-in-crime at the museum, Ronan.

Aye,
Matt