"主教祭服及徽章" can be translated into English as "episcopal vestments and insignia".
"Episcopal" refers to something related to a bishop or the episcopacy (the office or dignity of a bishop).
"Vestments" are the special ceremonial clothes worn by clergy, especially in the Christian Church.
"Insignia" are distinctive badges or emblems of office, rank, or membership, which in this context would refer to the badges or symbols worn by bishops.