I don't think so Roan. As I read this, the economy is knife pleated to the stripe - a limited edition wool heavyweight will be available in a box pleat.

From Jerry's site:

"We offer this tartan in our acrylic Economy Kilt (pleated to the stripe) and in our Standard Kilt line (pleated to the sett). We will also be offering it in our wool Heavyweight line (pleated to the sett), and we will also be making a limited run of Heavyweight Box-Pleat Wool kilts"