I did an 'armor of god, check it out' post. so check it out
Anyways, from what I know its prayer that puts it on. Hences the ppray everyday thing it has at the end. I think.
However one takes up the helmet, shield and sword. So those three I think are what is prayed on. The breastplate, belt, and 'boots' are more God given and are still prayed on. I really don't know how that works.
So, brestplate is Gods protection since yours is feeble. Belt holds it all together. 'Boots' help you be ready to move and go. Shield is protection you use. Helmet is protection you where. Sword is offence you use. Just a thought, hope it helps a little.