Clothe yourselves as Gods chosen people, holy and dearly loved. Paul does not say: First become holy. He says: You ARE chosen, holy, and loved, now clothe yourself accordingly. Live from it.
Identity in the New Covenant is not a reward for good behavior. It is the starting point. Compassion, kindness, humility, these are fruits that grow from your new nature.
Today you can put on what you already are.