Multiple armor phys reps

I have a leather breastplate that’s cumbersome enough to count for costume armor in addition to being my phys rep for the Chest Armor skill. I was thinking of trying to find a lighter waistcoat that could count for Chest Armor (but not grant costume armor), to change into at times when it’s too hot for the breastplate.

  1. Am I allowed to bring two Chest Armor phys reps and change between them in game?
  2. If one of them is broken by a Pierce call, and I change into the other one, do I regain the benefits of the Chest Armor skill? Or do I still need to perform a repair first?