I Made this Ghost busters ‘no-ghost’ symbol costume 5 years ago for my son. We first purchased a cheep dollar store hula hoop. Then we cut out cardboard pieces in a circle shape and two long cardboard strips to cover the hoop from both sides (like a sandwich). We made the middle piece the same way and then wrapped the whole thing in red duct tape. I added a small

I added a small cushion at the top where the hoop rests on the neck and I also wrapped that in red duct tape. I Bought a white hoodie from a store, painted my son’s face white and he was set.  The red “no-something” hoop could be used with so many other ideas.