Hi folks,
i read about people struggling with getting the right material cloth for the C.bund and Codpiece, over and over again, so i'd like to point out to bedsheets. Modern bedsheets use the same material and batting as you're looking for. The material is right, a cotton/polyester mix, (it has that very light kinda blueish-but-not-really shine to it, which comes from the polyester fibre in daylight and which makes it look so different to the cotton material used for the pouches), batting included. If you get the right sheet of course, polyester filling, not down. Opt for the summer version and you should be alright. And even if a bedsheet should be more expensive than fabric and batting, you can go to the store, get a feeling of the material and then headover to the fabric store, with more confidence.