The Apparel module of the framework has two comp classes that can be added to any apparel item to provide special behaviours:

• Camouflage: Hostile pawns that wear this apparel will have their name hidden from the player, and they cannot be manually selected while on the map.
• Switch Apparel: New Comp that allows switching between different apparels, but only if they have the same layers and bodypartgroups.

They are all comp classes, so you just add them in XML in the <comps> tag of an appropiate hediff. Check any of the examples to see.