I don't know if it's been stated, but if you just want an armor to enchant so that you have an AC bonus in your armor slot with no penalty, why not take Silken Ceremonial armor from the Ultimate equipment? It has no downside other than only a +1 AC, and so you can use it if nothing else. Enchanted it can stack your AC bonus to help out, and it's pretty cheap all told. I'm using it for my Enchantress and it's working fine.