In my game, we allow armor to stack in certain ways.
Use highest soak/defense
certain other extra features are still usable. A flight suit will still provide oxygen, even if you are wearing a reflec bodyglove, etc.
Combine Enc and subtract 3 from the total when worn.
certain features, like noble regalia and resplendent robes, might not work as well under most circumstances. 0 HP attachment to armor to allow it to work with them. Think gilding, ceremonial armor that's actually functional, etc. Otherwise, wearing them together might modify social rolls...depending on the encounter.
Worked very well for us fir quite some time now, but... š¤·āāļø