You need to use knit fabric for a twisted headband. Three knit fabrics that I love to use for a twisted headband are cotton spandex jersey, double-brushed poly, or French terry with spandex in the blend.
– Cotton spandex fabric – Sewing tool – Sewing machine
Cut a rectangle that is 8 inches tall and 20 inches wide. The 20 inches should go with the direction of the stretch.