Needs taller garbage bag hair.

Now that I'm working out the size of the hair in my head and how I would go about building it, I wonder how much it would weigh. If I were to build it, and assuming that Gon stands at 6', then the hair would be 18' tall. Including Gon's body, him plus the hair would stand at a whopping 24' tall!
To make 18' of hair with my usual materials, I'd have to build an armature, and that itself would easily weigh fifteen-twenty pounds, depending on materials. For it to be sturdy, I'd build a central tower out of PVC pipe, and build the framework around it with other materials. Then, the outer covering would require at least five-ten rolls of duct tape.
Wearing that would require your neck to support nearly thirty pounds (if not more) of headdress.
Another option would be to get a small air pump or a fan and make the hair out of a nylon material and just have a fan constantly blowing air into it to keep it inflated.