LX. To the Same Again.
Hear my voice, you who wish to remain a Christian woman, in what way the blessed Paul commands you to be adorned. Isaiah, moreover, the teacher and author that spoke from heaven, for he detests those who follow the wickedness of the world, says: The daughters of Zion that are lifted up shall be brought low. It is not right in God that a faithful Christian woman should be adorned. Do you seek to go forth after the fashion of the Gentiles, O you who are consecrated to God? God's heralds, crying aloud in the law, condemn such to be unrighteous women, who in such wise adorn themselves.
You stain your hair; you paint the opening of your eyes with black; you lift up your pretty hair one by one on your painted brow; you anoint your cheeks with some sort of ruddy colour laid on; and, moreover, earrings hang down with very heavy weight. You bury your neck with necklaces; with gems and gold you bind hands worthy of God with an evil presage. Why should I tell of your dresses, or of the whole pomp of the devil? You are rejecting the law when you wish to please the world.
You dance in your houses; instead of psalms, you sing love songs. You, although you may be chaste, do not prove yourself so by following evil things. Christ therefore makes you, such as you are, equal with the Gentiles. Be pleasing to the hymned chorus, and to an appeased Christ with ardent love fervently offer your savour to Christ.
Source: Writings (New Advent)