Cattail hat!

My partner made her first cattail hat, it’s awesome, and fits so nice!

Thing is, as it’s her first, and she didn’t have any pattern she’s not 100% satisfied. Wondering if anyone else has experience weaving with cattails or similar plants. Love to see some photos I can share. Specifically, she wasn’t satisfied with the brim, trying to curve the wide plant material. Any tips would be appreciated. Cheers!