>>8516581Lego uses a poly-cotton broadcloth, but you can use any type of textile from a local hobby store. You got to give it an acrylic coating otherwise it'll get destroyed easily. You can soak the cloth in a warm solution of water/gelatin to make it stronger. Then you just cut it out. I used a nail to cut out the hole. I'm not the best at crafts stuff, but I can look for something I made in the past with this. It doesn't feel soft like a cape, but it has the same look, and the rigidity is nice if you want to do custom stuff like trenchcoats.
There are also eight jillion stores on etsy/lego shops that make custom shops.
