God tells us to put on Christ. (Ro 13:14) The Greek is enduo, to invest, clothe or cover with, and is translated array (Ac 12:21), endue (Lk 24:49), clothe (2Co 5:3), have on (Ep 6:14), and here put on.
Putting on Christ is acting out the fact that He dwells in me and is living through me, working within me, through my own emotions, will and spirit, to will and to do according to His good pleasure. (Php 2:13) It’s emulating, imitating (1Pe 2:21), acting as if Christ is living out His life in and through me, a type of pretending, but about what actually is true.
We might begin like this, pretending as if we’re in perfect union with Christ, even though we might not yet be in practice, but wanting this, envisioning this, like an athlete training his mind for perfect performance, long before it’s reality. Then, moving toward belief, beholding Him, studying Him, practicing Christ-likeness as we grow up in Him unto certainty and reality, doing all in His name (Col 3:17), through Him, with Him and for Him. (Ro 11:36)