A codpiece is an old-fashioned item, not used in modern clothing, related to history or costumes. At the medieval fair, actors dressed in period costumes, complete with codpieces.
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Masculine Fashion
Codpieces were specifically for men and reflected masculine fashion trends of the past. Codpieces became prominent as a symbol of masculinity in Renaissance fashion.
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Protective Purpose
Originally, codpieces served a protective function before evolving into fashion statements. Knights' armor included a codpiece for crucial protection in battle.