Had this idea during the late shift.
Hear me out.
Either cannon fodder kind of jumpsuit, generic "uniforms" or uniforms of others in the death fields we've seen. Feet ending in the odd mechanical, crude aproximation, clawed metal feet or just boots - could be a fun mix of them.
Bodies with battle damage, but with machines inserted and festooned on them, from tubes to odd canisters to exoskeletal support systems. Heads with sensor spines, clusters of lenses and cameras, or just bolted on metal...alternative heads could have trailing tubes to the chest (limiting head poses, but a fun idea) or armored helmets to rob undead hunters of that tried-and-true headshot, their guant faces peering out from the visors...or totally enclosed.
Arms...perhaps different poses of arms, with optional forearms, such as an array of industrial tools for melee, or weapons, the heavier of such might be just shoulder mounted and have a generic "ammo" pack to help bulk the design out a bit.
And of course, and fun odd part the designers might want to toss in there in order to customize them out. Sensors and gear to turn one into a walking control relay as a "command" zombie? A bunch of apendages to make a spider-like repair undead (like a medic)?
Heavy support being less human species, or maybe more mechanically built up to be walking gun platforms on treads, spider legs or antigrav plates, their bodies fused to the support system?
As to the reason: how could the battle be less exciting with the combatants battling that which does not stay down? Just another exciting challange, inspired by earth myth, made possible with advanced technology.
What does everybody think?