From Indygo Junction. Fun and easy! One or two cotton fabrics will work well but for a bit of fun, try it in corduroy too. And the instructions let you choose whether to make it unlined or reversible.
2 Coordinating Fabric Version:
1/2 metre Main Fabric
3/8 metre Coordinating Fabric for inside of brim
Single Fabric Version:
3/4 metre fabric
1/2 metre of EACH of 2 coordinating fabrics
3/8 metre fusible midweight interfacing such as Bosal