Wow those are some very impressive looking belts for only
cardboard but regardless when you improve on title designs
etc try using leather, it be able to go under sale fast with
the way your belts look now.
Edit: Basic material would include Velcro straps on
both ends of the belt or the 4 hole or more buttons
they use on real belts. A good template for a face
plate or if you can design one yourself would be
good to. Diamond studs and whatever logos/custom
pics you want on your belt.
Here's an example