There are two kinds of hats used in Peking opera, irrespective of the period. Hard hats, called Kuei can only be worn by emperors, nobles and military officials.
盔頭可粗分二類：硬的叫「盔」，軟的稱「巾」。盔是最莊重的禮帽，只有皇帝、王爵、武官能戴。