This character wears a brooch.

A brooch, also known in ancient times as a fibula, is a decorative jewelry item designed to be attached to garments, often to hold them closed. It is usually made of metal, often silver or gold but sometimes bronze or some other material. Brooches are frequently decorated with enamel or with gemstones and may be solely for ornament (as in the stomacher) or sometimes serve a practical function as a fastening, perhaps for a cloak.