Armor Kilt plus Mage Armor?

[Doomed Hero]

Would they stack?

Armor Kilt wrote:

When you add an armored kilt to a suit of light armor, the set counts as medium armor. Likewise, a kilt and medium armor counts as heavy armor.

Mage Armor adds a +4 Armor bonus, but does not actually count as Light or Medium armor.

How do these rules interact (if at all)?

[turing85]

PRD, CRB, Equipment, Armor:

Quote:

[...]

Armor/Shield Bonus: [...] The armor bonus from a suit of armor doesn't stack with other effects or items that grant an armor bonus. [...]

PRD, CRB, Spells, Mage Armor:

Quote:

[...]

An invisible but tangible field of force surrounds the subject of a mage armor spell, providing a +4 armor bonus to AC.
[...]

(The highlighting is done by me and not part of the RAW)

If you are wearing some form of armor, the higher armor bonus counts (either armor + kilt or mage armor) since they are both armor bonusses and do not stack. You cannot apply a Kilt to Mage Armor since Mage Armor is neither light nor medium armor.