DF: Armor Layering and Enchantments

[Bruno]

I've seen nothing to indicate that layering enchanted armour on top of enchanted armour would work any differently than layering non-enchanted armour on top of enchanted armour, or normal armour on top of normal armour, or whatever.

It's not specifically discussed, but that's because GURPS doesn't have "stacking" rules, particularly. Unless something explicitly tells you how to math things, assume everything is working as per grade school.

This does mean also that layering Penetrating Weapon (faces 1/2 DR) on top of a bodkin (faces 1/2 DR) gets you an arrow that only faces 1/4 DR. And so forth.

There are endless jokes about wearing 5 T-Shirts enchanted with Fortify +1 instead of scale.