Adam Clarke, on 1Pet 3:5

For after this manner - Simplicity reigned in primitive times; natural ornaments alone were then in use. Trade and commerce brought in luxuries; and luxury brought pride, and all the excessive nonsense of Dress. No female head ever looks so well as when adorned with its own hair alone. This is the ornament appointed by God. To cut it off or to cover it is an unnatural practice; and to exchange the hair which God has given for hair of some other color, is an insult to the Creator. How the delicacy of the female character can stoop to the use of false hair, and especially when it is considered that the chief part of this kind of hair was once the natural property of some ruffian soldier, who fell in battle by many a ghastly wound, is more than I can possibly comprehend. See the notes on Co1 11:14-16 (note); and Ti1 2:9 (note). Who trusted in God - The women who trust Not in God are fond of dress and frippery; those who trust in God follow nature and common sense. Being in subjection unto their own husbands - It will rarely be found that women who are fond of dress, and extravagant in it, have any subjection to their husbands but what comes from mere necessity. Indeed, their dress, which they intend as an attractive to the eyes of others, is a sufficient proof that they have neither love nor respect for their own husbands. Let them who are concerned refute the charge.