Hey you stole my idea . It's a good idea though. I was hoping they'd go a step further and make different resources in game make different colored armors and weapons.

Iron-Steel = Grey weapons and armor

Mithril = kinda blueish weapons and armor

Bloodstone = Red weapons and armor

That would bring a lot to the table for unit design and is relatively easy to do. Just recolor the standard model/skins for the items in game.

It could even be a tabard that changes color i think if you dont want to do armor coloring

It's not about the visuals, it's about telling the freaking difference between the two groups of sowrdsmen brawling on top of the hill... I think this is actauly a more crucial feature than you think.

You could easily put in a 'clothing' equipment type with tabards, coats, cloaks, jackets, fancy hats, whatever. Make it a simple matter of picking something to give to your troops - by default steel armor over brown leather shirts, something simple like that, but with the option to pick 'green tabard' or 'red cloak' or 'purple royal robe plus fancy feathered hat' and customize the appearance of the unit that way.

Something like the warhammer series could be fun. You know, you design the colors and emblem of the army, which is then unique to you, and it applies to all of your units^^