there is only one unit using swords and some metal helmets, these are elite guys who could afford some status symbols. their upgrade use scale armour made out of bone and horn, there is no unit with metal armour.
most units has clothing dyed with simple colours that can easily be found in nature. most upgrades use leather or fur.
there is also a single cavalry unit that use something in the way of a fabricated gambeson.
keep in mind that this is a computer game and each faction needs a modicum of units to make them playable.