Use hot glue to adhere the eyes above the mouth. Then cut an oversized piece of black mesh to glue behind the mouth. This can be tulle, screen door material, interfacing or net. Make sure you can see through it without much trouble, especially if you plan on trick or treating at night. To make sure the net is properly attached, place blue scrap nylon to sandwich the glue and net to the nylon.
Cut two lengths of blue ripstop nylon 48″ long and X” wide. The X equals the circumference of your armhole. Ours is 26″ around. Since this is ripstop nylon, you just need to make a small cut then rip the remainder of it. This will produce some strands of cloth. Just pull them off so the hot glue doesn’t grab them.
Time to test out your costume and work on your moves. I couldn’t find the 6′ children’s tunnel so I opted for the 9′. This meant there was extra room on the top and the tunnel wouldn’t stay straight by itself. So, I added a backpack with a PVC rod inside it to keep the head standing up straight. It also added plenty of height and interest to the piece.