Peter talks about arming oneself with a thought/attitude:
Since therefore Christ suffered in the flesh, arm yourselves with the same way of thinking, for whoever has suffered in the flesh has ceased from sin, so as to live for the rest of the time in the flesh no longer for human passions but for the will of God.—1st Peter 4:1-2 (ESV)
This seems distinct from the different aspects of armor that Paul describes in Ephesians 6:10–20. In that passage, various aspects of the Christian life (righteousness, salvation, Scripture, and so on) are metaphorically associated with equipment a soldier would rely on. Is there a reasonable relationship here?
Alternatively, is there another passage that describes armor in terms of an attitude or approach to take like Peter is?