*Disclaimer. I fly by the seat of my pants a lot while crafting, so I don't have exact measurements, but I will show you how to find your own measurements the best that I can.*
All you need is:
An old skirt
The nice thing about using the waistband is that a lot of the work is already done for you. To make it a stable hat, it needs to have at least two layers of fabric. The waistband in this skirt had it already put together for me. So, all I needed was to add a top a brim and embellish.
Charli told me that she really loves it and that is good enough for me!
Now it's your turn. Go find that skirt that doesn't fit anymore and make it into something that you will wear and love! I would love to see what you come up with if you do make one. You can send me a link to show me at firstname.lastname@example.org, or you can just leave a comment with a link to your post.
Good luck and please feel free to ask me any questions if anything was unclear.