Make a cowboy hat?
maybe you want to buy one and bling it up w/ Victorian looking brooches and beads?
Belt fabric: vynil in the outdoor section of your fabric store, velvet-like fabric backed with stiff iron on facing? You can buy a remnant and piece it. Craftster or all free sewing can help with how to.
Good luck! Let us know how you do.
I've made a number of costumes and would love to see a pic.
Happy Saturday to you too.