As far as I can remember if you are planning on casting spells in battle, then the only armour you can have is mage armour, and probably shouldn’t confuse things by wearing stuff that cannot be counted, it’s unfair on long distance archers and the refs trying to work out if you’re taking hits or not correctly.
If you plan on only using mechanical healing, Chirurgeon and Physik skills then you can put as much armour on as you like, and save the spell casting for Anvil town. (At a player event I watched someone in full armour race to strip if all off as fast as possible to cast an emergency open portal, while his 3 mates held back the hoards which was absolutely nailbiting!)
Possibly best to get an official answer from Rules@ though for your specific circumstance / character build.