Let your beauty be not just the outward adorning of braiding the hair, and of wearing jewels of gold, or of putting on fine clothing;
adornment -- outward -- Such “external … adorning” can be witnessed in portraits and sculptures from the first century, where the elaborate braiding of women’s hair and the wearing of ostentatious jewelry was common in upper-class Roman society. In contrast to this, the Christian woman should focus on inner (hidden) beauty of the heart. What matters to God is the godly character of the wife, characterized by a gentle and quiet spirit. It is clear that Peter is not literally prohibiting all braiding of hair or all wearing of gold jewelry, because if this were the case the same prohibition would apply also to wearing clothing! Instead, Peter warns against both an inordinate preoccupation with personal appearance and material excess in such matters. - ESVSB