Catholics are expected to dress modestly; it is recognised that the forms taken by modesty vary from one culture to another.[38] The wearing of a Christian headcovering at Mass was for the first time mandated as a universal rule for the Latin Rite by the Code of Canon Law of 1917,[39] abrogated by the 1983 Code of Canon Law.[40] Apart from that, there have never been any "official" guidelines issued by the Catholic Church.