The [corset of dire witchcraft](http://www.archivesofnethys.com/MagicWondrousDisplay.aspx?FinalName=Corset%20of%20Dire%20Witchcraft) is a body slot item that grants an armor bonus of 4. It is neither armor nor shield and while regular clothing can be the target of [magic vestment](http://www.archivesofnethys.com/SpellDisplay.aspx?ItemName=Magic%20Vestment), it is treated as armor that grants no AC bonus.

So, if I cast magic vestment on the corset, does its armor bonus stack with the enhancement bonus granted by the spell?