It's not exactly a hat I would put on my head--the inside is still unfinished and would stick.
I used wire to create the shape I wanted then covered the wire with duct tape. The ribbon is just for looks of course.
I used this duct tape hat to create the pattern for my regency bonnet. Unable to think of a way to draft the curved brim I needed, I finally decided to first make it in 3-d, and then drape interfacing over it to create my brim piece.
But of course I couldn't throw away such a cute hat, so it resides on the shelf next to all my others.