Quote Originally Posted by Alan H View Post
Well,my method won't work 'cause I think you've already sewn the inside edges to each other. And in fact, you're hosed by having done that, because due to the taper in the pleats, which is quite large in a box pleat kilt, the inside edges overlap each other up by the waist,rather than lying edge to edge.

At least I think you've already sewn the inside edges together.

I'd recommend ripping them out, if you have, and then doing as Barb suggested.
It seems it would be easy to incorporate tapering in as you're drawing the lines before sewing.