Thomas Aquinas

“ Those offenses which are contrary to the customs of men, are to be avoided according to the customs generally prevailing, so that a thing agreed upon and confirmed by custom or law of any city or nation may not be violated at the lawless pleasure of any, whether citizen or foreigner. ”

“ We must avoid excessive pleasure in the use of things, for it leads not only wickedly to abuse the customs of those among whom we dwell, but frequently to exceed their bounds, so that, whereas it lay hidden, while under the restraint of established morality, it displays its deformity in a most lawless outbreak. ”

“ Whoever uses outward things in such a way as to exceed the bounds observed by the good people among whom he dwells, either signifies something by so doing, or is guilty of sin, inasmuch as he uses these things for sensual pleasure or ostentation. ”

“ In the case of an art that produces things which for the most part some people put to an evil use, although such arts are not unlawful in themselves, nevertheless, according to the teaching of Plato, they should be extirpated from the State by the governing authority. ”

“ Whether there can be virtue and vice in connection with outward apparel?
(2) Whether women sin mortally by excessive adornment?
Art. 1 - Whether there can be virtue and vice in connection with outward apparel? Objection 1: It would seem that there cannot be virtue and vice in connection with outward apparel. For outward adornment does not belong to us by nature, wherefore it varies according to different times and places. ”

“ I hold that not only virgins and widows, but also wives and all women without exception, should be admonished that nowise should they deface God's work and fabric, the clay that He has fashioned, with the aid of yellow pigments, black powders or rouge, or by applying any dye that alters the natural features. ”

“ I do not wish you to be hasty in forbidding the wearing of gold or costly attire except in the case of those who being neither married nor wishful to marry, should think how they may please God: whereas the others think on the things of the world, either husbands how they may please their wives, or wives how they may please their husbands, except that it is unbecoming for women though married to uncover their hair, since the Apostle commands them to cover the head. ”

“ Nevertheless a woman may use means to please her husband, lest through despising her he fall into adultery. Hence it is written (1 Cor. 7:34) that the woman "that is married thinketh on the things of the world, how she may please her husband." Wherefore if a married woman adorn herself in order to please her husband she can do this without sin. ”

“ As stated in the foregoing Article, outward apparel should be consistent with the estate of the person, according to the general custom. Hence it is in itself sinful for a woman to wear man's clothes, or vice versa ”

“ Those who are placed in a position of dignity, or again the ministers of the altar, are attired in more costly apparel than others, not for the sake of their own glory, but to indicate the excellence of their office or of the Divine worship: wherefore this is not sinful in them. ”

“ Dom. in Monte ii, 12) that "not only the glare and pomp of outward things, but even dirt and the weeds of mourning may be a subject of ostentation, all the more dangerous as being a decoy under the guise of God's service"; and the Philosopher says (Ethic. iv, 7) that "both excess and inordinate defect are a subject of ostentation."
Reply to Objection 1: Although outward attire does not come from nature, it belongs to natural reason to moderate it; so that we are naturally inclined to be the recipients of the virtue that moderates outward raiment. ”

“ For any part, which harmonizeth not with its whole, is offensive." Secondly, the lack of moderation in the use of these things may arise from the inordinate attachment of the user, the result being that a man sometimes takes too much pleasure in using them, either in accordance with the custom of those among whom he dwells or contrary to such custom. ”