Council of Trent: Session XIV, Reformation, Chapter VI

CHAPTER VI. A penalty is decreed against clerics, who, being in sacred Orders, or holding benefices, do not wear a dress beseeming their Order.

And forasmuch as, though the habit does not make the monk, it is nevertheless need ful that clerics always wear a dress suitable to their proper order, that by the decency of their outward apparel they may show forth the inward correctness of their morals; but to such a pitch, in these days, have the contempt of religion and the rashness of some grown, as that, making but little account of their own dignity, and of the clerical honour, they even wear in public the dress of laymen--setting their feet in different paths, one of God, the other of the flesh;-for this cause, all ecclesiastical persons, howsoever exempted, who are either in sacred orders or in possession of any manner of dignities, personates, or other offices, or benefices ecclesiastical; if, after having been admonished by their own bishop, even by a public edict, they shall not wear a becoming clerical dress, suitable to their order and dignity, and in conformity with the ordinance and mandate of the said bishop, they may, and ought to be, compelled thereunto, by suspension from their orders, office, benefice, and from the fruits, revenues, and proceeds of the said benefices; and also, if, after having been once rebuked, they offend again herein, (they are to be coerced) even by deprivation of the said offices and benefices; pursuant to the constitution of Clement V. published in the Council of Vienne, and beginning Quoniam, which is hereby renewed and enlarged.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).