Mage armor says you use your unarmored proficiency but doesn't say specifically that you can't be using armor as well. Is that covered somewhere else. Maybe under unarmored proficiency?
What has me confused is the spell description never says you cannot be wearing armor or that you use the best between Mage Armor and your worn armor.
In 1e you couldn't mix and match Mage Armor and armor.
In 2e I don't feel it is clear that you can be wearing armor and benefit from Mage Armor (if that is the intent?) Am I missing something?
You can wear both if you want, but all either of them does is provide an item bonus, and those don't stack. So if you want to wear light armor for the times when you don't have mage armor on, you don't have to take it off to get mage armor, but it doesn't provide any extra benefit once you have both.
EDIT: Yes, I know mage armor lasts all day so you'd never actually "wear light armor for the times when you don't have mage armor on," it was just an example. Maybe you want the real armor for the times when you walk into an AMF.
You can wear both if you want, but all either of them does is provide an item bonus, and those don't stack. So if you want to wear light armor for the times when you don't have mage armor on, you don't have to take it off to get mage armor, but it doesn't provide any extra benefit once you have both.
EDIT: Yes, I know mage armor lasts all day so you'd never actually "wear light armor for the times when you don't have mage armor on," it was just an example. Maybe you want the real armor for the times when you walk into an AMF.
See it now... thanks.