5 But if continency follows Christ, and virginity is destined for the kingdom of God, what have they to do with earthly dress, and with ornaments, wherewith while they are striving to please men they offend God? Not considering that it is declared, “They who please men are put to confusion, because God has despised them;” and that Paul also has gloriously and sublimely uttered, “If I yet pleased men, I should not be the servant of Christ.” But continence and modesty consist not alone in purity of the flesh, but also in seemliness, as well as in modesty of dress and adornment; so that, according to the apostle, she who is unmarried may be holy both in body and in spirit.
Paul instructs and teaches us, saying, “He that is unmarried cares for the things of the Lord, how he may please God: but he who has contracted marriage cares for the things which are of this world, how he may please his wife. So both the virgin and the unmarried woman consider those things which are the Lord's, that they may be holy both in body and spirit.” A virgin ought not only to be so, but also to be perceived and believed to be so: no one on seeing a virgin should be in any doubt as to whether she is one.
Perfectness should show itself equal in all things; nor should the dress of the body discredit the good of the mind. Why should she walk out adorned? Why with dressed hair, as if she either had or sought for a husband? Rather let her dread to please if she is a virgin; and let her not invite her own risk, if she is keeping herself for better and divine things. They who have not a husband whom they profess that they please, should persevere, sound and pure not only in body, but also in spirit. For it is not right that a virgin should have her hair braided for the appearance of her beauty, or boast of her flesh and of its beauty, when she has no struggle greater than that against her flesh, and no contest more obstinate than that of conquering and subduing the body.
Source: The Treatises of Cyprian (New Advent)