I've created the ultimate converter lung for cosplay. Rigid materials restrict movement and can damage the suit. For example, try putting a cutting board or phone book in your chest and bending forward or backward. You'll find it quite difficult to move. This is the ultimate converter lung made of urethane rubber sponge, cotton, and silicone. It's been very well-received locally. Sew the edges of the lung to your suit, about 5mm in from the edge. If you can sew a rag, you can do this. Currently, it has a glossy finish, but you can make it matte by applying baby powder and wiping it off with a wet towel. If you want to see a video, please search on Yahoo Auctions with the same title. Current Status