Hair Barrettes are loomed rectangles, stiffened with plastic, sturdy clip sewn on, and securely sewn onto a cloth backing. They are fully washable. Any pattern from the pattern book and any combination of colors can be done. I'm still wearing barrettes that I made over 10 years ago.
Small (3 ¼" x 2 ½") : $15 ea or $25/pr
Do check out the barrette patterns available. Other patterns can be specially made (for instance, incorporating initials).