Job 29:14 “I put on righteousness, and it clothed me; My justice was like a robe and a turban.” (NASB)
Galatians 3:27 “For all of you who were baptized into Christ have clothed yourselves with Christ.” (NASB)
(See: Ephesians 4:24, Colossians 3:10, 12.)
"It means not only to put on the character of Christ, but also signifies letting Jesus Himself be the armor that you wear." Pillar New Testament Commentary