The Caeremoniale Episcoporum recommends, but does not impose, that in solemn celebrations he should also wear a dalmatic of a thinner and lighter fabric which can always be white, beneath the chasuble, especially when administering the sacrament of holy orders, blessing an abbot or abbess, and dedicating a church or an altar.[2][3] A tunicle was also worn until the apostolic letter Ministeria quaedam of August 15, 1972, decreed that, with effect from January 1, 1973, the functions that in the Latin Church had been assigned to the subdeacon should thenceforth be carried out by the instituted ministers (not members of the clergy) known as lectors and acolytes.[citation needed] The Sakkos is normally worn only when the bishop is celebrating the Divine Liturgy, or during the Great Doxology at the All-Night Vigil.At other services, or when he is "presiding" but not serving at Liturgy, he will wear the Mantya, a cape with a long train and red and white ribbons ("rivers") running along the sides.The right to wear a pectoral cross or mitre may be bestowed upon other (lower) clergy as a sign of honour due to some outstanding achievement or dedication.