With purple yarn and 4.00 mm (G) hook
R1: Sc in 2nd ch from hook and in each st across, ch1, turn.(78)
R2: Sc in each st across, ch1, turn. (78)
R3-6: Repeat R2. (78)
Fasten off. Using yarn needle, whipstitch the ends together to form a ring.
Now place the strap exactly where the brim starts and sew in place.