Pectoral Egyptian Pectoral Ornament Depicting Horus and Seth, c. 12th Dynasty. Photo Courtesy of the Myers Museum, Eton College. Pectoral refers to jewelry worn on the pectoral muscles, i.e. the breast. Sevigne brooches, as well as military decorations, are examples of pectoral decorations, although the former was usually worn at the midpoint of the breasts.