Battle Dress in the Imperium is complex and generally misunderstood. If you were designing Battle Dress and it didn't currently exist in the Third Imperium what capabilities would it have? Would there be integral weapons? Electronic Warfare? Would the exoskeleton add strength or just endurance? Inquiring minds want to know.
Have it be modular, so you can build platoons of armored soldiers. An long range comms/EW module, a belt fed grenade module, a heavy weapons ammo/power supply module, zero G jetpack module, etc.
What do you think are the most important things to have as auxiliary systems on battle draft?