I didn't take many process shots (do I ever?) but it's a very simple design. A rectangle of fabric about 115cm by 35cm. Folded into pleats about 5cm deep. The pleats are folded together in pairs. It's actually quite difficult to describe in words, but hopefully it's fairly obvious from the picture.
I added an elasticated waist-band. It worked out okay, but it's not what I'm looking for. Another prototype will be coming along shortly.