@wffl if crochet is an option, there are some nice patterns on Etsy. Here is a free one which I personally adore - it's not your typical witch hat but I think you can make it work:
https://handcrafted.craftsforlove.com/crochet/snail-shell-hat-free-crochet-pattern-a-stylish-and-cozy-accessory-tutorial/









