The pattern is written for an adult approximately 19 inches which should fit most adults. If you’d like to size it up or down, simply increase or decrease by 6 stitches. Each 6 stitch shell is approximately 1.5 inches. If you want a thinner headband, stop after 2 or 3 rows.
Note: This headband is worked in the round, you will be joining each round and not turning.