That your faith should not stand in the wisdom of men, but in the power of God. The breastplate protects our heart and the heart determines the course of life. If we are in right standing with GOD there is no guilt or condemnation. Righteousness is to remain free from sin it is our guardian of the heart . Christ righteousness is glorious armor for us to wear in a world of sin.
Truth is what true believers stand on.
It provides for honest things in the sight of the Lord but also in the sight of men. We are to stand on the truth of the bible. We have to be sure that we are wearing the belt of truth. The belt refers to behavior, honesty,and life style. Truth is all that matters to a true christian.