Liturgical Vestments (Part II)
[126.] The abuse is reprobated whereby the sacred ministers celebrate Holy Mass or other rites without sacred vestments or with only a stole over the monastic cowl or the common habit of religious or ordinary clothes, contrary to the prescriptions of the liturgical books, even when there is only one minister participating. In order that such abuses be corrected as quickly as possible, Ordinaries should take care that in all churches and oratories subject to their jurisdiction there is present an adequate supply of liturgical vestments made in accordance with the norms.
[127.] A special faculty is given in the liturgical books for using sacred vestments that are festive or more noble on more solemn occasions, even if they are not of the colour of the day. However, this faculty, which is specifically intended in reference to vestments made many years ago, with a view to preserving the Church’s patrimony, is improperly extended to innovations by which forms and colours are adopted according to the inclination of private individuals, with disregard for traditional practice, while the real sense of this norm is lost to the detriment of the tradition. On the occasion of a feastday, sacred vestments of a gold or silver colour can be substituted as appropriate for others of various colours, but not for purple or black.
[128.] Holy Mass and other liturgical celebrations, which are acts of Christ and of the people of God hierarchically constituted, are ordered in such a way that the sacred ministers and the lay faithful manifestly take part in them each according to his own condition. It is preferable therefore that “Priests who are present at a Eucharistic Celebration, unless excused for a good reason, should as a rule exercise the office proper to their Order and thus take part as concelebrants, wearing the sacred vestments. Otherwise, they wear their proper choir dress or a surplice over a cassock.” It is not fitting, except in rare and exceptional cases and with reasonable cause, for them to participate at Mass, as regards to externals, in the manner of the lay faithful.