I think the most feasible is just changing the metal or leather colour to certain degree.
I dont know wheather their engine is triangulating quaded models, but models oughtt to be quaded as they are being animated slightly ( we ve seen the shoulder pads flapping separately on a khuzait horseman some time ago), but since my 3D modeling is very humble to non existent after 4 years of not touching any program of sorts, i wouldn't know for sure.
What i DO know is that you CAN customise your character more than before. We have underlayer which can be any cloth with "unarmored" attribute.
Then we have "head", "body", "cape", "arm", "leg" armor layers, the "cape" being one giant mixed group of scarves, animal pelts, cloacks, shoulder armor and capes. I was very loud for shoulder armor being in a separate group from others mentioned in it, i even just recently opened
this thread in the Suggestion child board of Beta for it.
As it is now, only 2 "cape" layers include both shoulder armor AND a cape of some sort. You cant have more that 1 "cape" layer on you character so you need to choose;either shoulder armor or a cape/pelt/scarf/cloak.
Something can be done in this area so we have more layers of armor, and maybe cloth color and metal color of already exsisting items (iron,steel,bronze, silver, gold), then the armor crafting feature as such wouldn't really be necessary, as we would have huge freedom in customising the general armor apearance inside some reasonable boundaries.