Magic green shirt
From XFamily - Children of God
The "magic green shirt" is a reference to a dream in which David Berg imagined his adopted son, "Davidito," was unable to be dishonest in any way while wearing a special shirt.
Excerpt from The Magic Green Shirt (ML #629:61):
Beloved, have you donned the Magic Green Shirt of God's Spirit of truth & honesty? --Do you have the power of Christ's Spirit dwelling in your heart so that you do not lie nor deceive nor cheat & are always honest with others?