These headbands are hand crocheted by me and the button closure varies. If they stretch out you can either button them in a different hole to make them smaller or wash them in hot water and let them air dry, this will help them to shrink back up. They cost $4.00. I have two that are 18.5", two that are16.5", and one that is 14.5" in length.
It occurred to me that you might want to see how a flower attaches to this headband. An example can be found below.
