From peri (around) and ballō (to throw/cast). To throw around, to clothe, to dress. Used of both physical clothing and the spiritual clothing of righteousness, glory, and the new resurrection body.
In Revelation, the overcomers are 'clothed in white garments' (Revelation 3:5) — representing the righteousness of Christ imputed to believers. Jesus warns against worrying about what to wear since God clothes the lilies (Matthew 6:28-29). Paul eagerly anticipates being 'clothed' with the heavenly dwelling (2 Corinthians 5:2-4). God clothes His people — in righteousness now and in glory at the resurrection.