The stitch you need for hemming is a herringbone stitch. You should be able to google it. The herringbone stitch in a catch stitch so don't go thru the kilt just catch a thread or two on the outer material. The hem isn't that important but you need to make sure you make the hem even all the way around by measuring and basting. Then you can hem and once your are finished you need to press. I would recommend that you baste the pleats at the bottom to hole them in place during pressing.