Crafting magic armour?

[DarkCrisis]

What does a caster need to craft a suit of +4 magic armor?

Some of us say you have to have the spell "Magic vestment"

Others say all you need is the feat and a level 12 caster.

 

[Oni]

You don't need any spell for just plusses to armour, just a caster level at least three times the enhancement bonus.