For the headband version, measure two pieces of grosgrain ribbon to fit your skull, and mark/cut to length. The hair elastic will make up for the lack of seam allowance.

Using a zigzag stitch on your sewing machine, stitch the edges of the ribbons together leaving the last 1.5 inches unstitched.

Fold over the raw ends around a hair elastic and stitch in place for a stretch fit!

If you don’t plan to add electronics, you can make the headband with just one piece of ribbon.

Fold the headband in half and crease it at the mid point, then hand stitch the horn in place through the sew tabs and wear.