Barrettes are worn according to size, with small ones at the front and large ones in the back. They are used to keep hair out of the eyes or secure hairstyles but can also be just ornamental.
Only girls wear barrettes: dress and appearance standards, community norms, and workplace equality. (Visions of Equality: The Future of Title VII)
Aug 01, 1994; [My son, Jeremy,] naively decided to wear barrettes to nursery school. Several times that day, another little boy insisted...