I don't fully understand what's new. I can add Mods, Armour and Enhancements to the social gear already, I've got companions wearing them. What is being added?
For a medium armor person if they wear a social gear (which at the moment is set for light armor) it gimps your armor rating . In other words if you wear medium armor and you use light armor you have actually cut your amor rating down by xx amount of points.
A friend of mine tried this on just one piece and it cut her armor down to 50 or so points on her amor and when you get higher it makes a big difference.
What they are doing now makes the amor work to what type of your amor is. You don't lose any rating/points on your armor this way and makes it more viable for anyone to wear it now (or when the patch goes live)