Shop Pistil Hats Olga headband. We’re a little in love with this fabric. We love its bold geometric pattern. We love the colors. We love the light crispness of the cotton woven fabric. You’ll find it in our hats, our bags, and here, we let it go to our heads. Pleated and wide, it adds just the right accent to your outfit. An elastic section at the back secures the fit.