A while back I read something on exoskeletons and suggested an HEV suit, but now I had an idea for a few other things-
What if each class had either a suit or an armor that gave effects?
A radiation suit, which IRL is basically a thin paper suit resistant to penetration of radioactive particles.
A combat suit, which in game could boost health or act as armor batteries,
A Power suit, which boosts backpacking and athletics but not health
And a Forcefield which blocks all damage