My kids love to create make-believe heroes and costumes. They plan their Halloween costumes for the next year as soon as November 1 rolls around. Superman had some new heroes that needed costume elements so we started our costume.
Trace eye holes onto your foam so you have placement for your mask. Then make your mask outline. Superman wanted to create a bat mask for his bat costume, and I wanted a fiery mask, so I started making a yellow one.
Try on your mask to make sure it's the right shape and size. Maybe try scaring your mom while you're trying it on...
Cut two pieces of yarn about a foot long. Carefully tie a knot at both ends to prevent fraying and to keep the yarn from pulling out of the staple. Carefully staple the yarn to the sides of the mask. (Hint learned from experience: Reinforce the mask with tape).
Show off your snazzy new mask to your mom. Then come up with a very long list of other costume pieces needed: bat wings, a belt, pants, shirt... The list goes on and on.