The term Peter uses here denotes the action of tying a garment around yourself. We might think of Jesus’ action in John 13:4: after laying aside his outer garment he tied a towel around his waist. With that action he presented himself as a slave. Such outward clothing gave expression to his inner garment of humility as Jesus began to wash his disciples’ feet.
5 Likewise, you who are younger, be subject to the elders. Clothe yourselves, all of you, with humility toward one another, for “God opposes the proud but gives grace to the humble.”