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More specifically, if I cast magic vestiments on a monk's clothing, and then they drink a potion of mage armor, do they get +4 or +5 total bonus to their AC.
At first they seem like they would stack, since Mage Armor provides an armor bonus, and Magic Vestiments provides an enchancement bonus.
But my understanding of magical armor pluses has always been that the enchancement bonus is added to the armor's armor bonus. So in my example the monk would have two sperate armor bonuses, 1 from the magical clothing, and 4 from the Mage Armor, and they wouldn't stack.
Any thoughts on the matter?

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Magic Vestment is cast on an item (armor or shield worn), not on the character. This means its enhancement bonus will only apply to that target item, not to an active instance of mage armor. Mage Armor is a force effect, not an item, and as such is not a valid target for the spell.
The net result is that you would cast Magic Vestment on their clothes, granting them a +1 armor bonus total from that source, then this would be overridden by Mage Armor's +4 armor bonus, for a final armor bonus of +4. Since Magic Vestment and Mage Armor have the same duration, it is rather redundant to cast Magic Vestment at all.

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Actually, Magic Vestments provides an enhancement bonus, as the OP stated, so I'd say, yes, as they are two different bonus types.
It adds an enhancement bonus to the targeted armor, not to the character. This means it will only improve the AC provided by the given armor source, not for all armor sources worn by the character. This is no different from how permanent enhancement bonuses to armor work.

AvalonXQ |

We've gone over this several times before.
Magic vestment provides an enhancement bonus to armor. The armor then provides an armor bonus to the character's AC.
Mage armor also provides an armor bonus to the character's AC.
The armor bonus from clothes or armor enchanted with magic vestment will not stack with the armor bonus from mage armor.

darkwarriorkarg |
You imbue a suit of armor or a shield with an enhancement bonus of +1 per four caster levels (maximum +5 at 20th level).
An outfit of regular clothing counts as armor that grants no AC bonus for the purpose of this spell.
An invisible but tangible field of force surrounds the subject of a mage armor spell, providing a +4 armor bonus to AC.
Unlike mundane armor, mage armor entails no armor check penalty, arcane spell failure chance, or speed reduction. Since mage armor is made of force, incorporeal creatures can't bypass it the way they do normal armor.
Magic Vestment: Enhancement bonus that can even be placed on regular clothing.
Mage armor: Armor Bonus.They stack. It's an enhancement bonus, not an armor bonus.

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Magic Vestment wrote:You imbue a suit of armor or a shield with an enhancement bonus of +1 per four caster levels (maximum +5 at 20th level).
An outfit of regular clothing counts as armor that grants no AC bonus for the purpose of this spell.
Mage Armor wrote:An invisible but tangible field of force surrounds the subject of a mage armor spell, providing a +4 armor bonus to AC.
Unlike mundane armor, mage armor entails no armor check penalty, arcane spell failure chance, or speed reduction. Since mage armor is made of force, incorporeal creatures can't bypass it the way they do normal armor.
Magic Vestment: Enhancement bonus that can even be placed on regular clothing.
Mage armor: Armor Bonus.They stack. It's an enhancement bonus, not an armor bonus.
They do not stack. Please stop reiterating this. It is not true. And it has nothing to do with bonus type.
The enchantment bonus may be a different type, but it's NOT an enhancement bonus to your character's AC, it's an enhancement bonus to the EQUIPMENT'S AC. This is a VERY important distinction. Because it enhances the gear, not you, you must improve the gear's number before applying that total as a separate bonus to your character. This means you are effectively comparing a +1 armor source with a +4 armor source, taking the +4 as its the higher bonus of that type.

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Magic Vestment wrote:You imbue a suit of armor or a shield with an enhancement bonus of +1 per four caster levels (maximum +5 at 20th level).
An outfit of regular clothing counts as armor that grants no AC bonus for the purpose of this spell.
Mage Armor wrote:An invisible but tangible field of force surrounds the subject of a mage armor spell, providing a +4 armor bonus to AC.
Unlike mundane armor, mage armor entails no armor check penalty, arcane spell failure chance, or speed reduction. Since mage armor is made of force, incorporeal creatures can't bypass it the way they do normal armor.
Magic Vestment: Enhancement bonus that can even be placed on regular clothing.
Mage armor: Armor Bonus.They stack. It's an enhancement bonus, not an armor bonus.
Casting Mage Armor on someone who has had Magic Vestment cast on their clothes and expecting them to stack is no different than someone wearing +1 leather armor underneath a suit of full plate and expecting the +1 from the leather armor to stack with the Full plate. They just don't.

Grick |

They stack. It's an enhancement bonus, not an armor bonus.
Enhancement Bonuses: "Enhancement bonuses apply to your armor to increase the armor bonus it provides."
Your armor (clothing) now has an enhancement bonus which will increase the armor bonus it provides.
Clothing provides a +0 armor bonus to AC.
Clothing under the effects of a CL 3 or less magic vestment spell has a +1 enhancement bonus, thus providing a +1 armor bonus to AC.

wraithstrike |

They don't stack. Magic Vestment provides an enhancement bonus to the armor bonus for the purposes of AC, which is another way of saying it increases the armor bonus. That is why it says the clothing counts as armor because you can't add an enhancement bonus to AC to nothing. It is either added to the armor or shield bonus.
Mage armor also provides an armor bonus.
Armor bonuses don't stack..

yeti1069 |

Several ways of proving the point:
As Ssalarn pointed out, the logic of the OP would imply that +1 leather armor worn under full-plate should provide a total of a +10 AC bonus (+9 armor, +1 enhancement), whereas we all know that isn't the case, or should.
If the enhancement bonus provided by Magic Vestment stacked with Mage Armor, because it is providing a different bonus type (armor vs. enhancement), then if you used Magic Vestment on both your armor and your shield, you would only ever get the enhancement bonus from one of those, since like bonuses do not stack. For example, if you cast MV on your full plate (9+1=10) and on your heavy shield (2+1=3), your AC should be 23, but under the Mage Armor + MV logic, you would only get 22, since the two enhancement bonuses wouldn't stack.