First' I'd suggest making a list of categories of the same material, therefore giving the sense of improved protection/quality to a same type of armor. Let's say you have a Bear Leather Armor, sounds nice, right? What about a Griffon leather Armor? Sounds much better! You could create a list of materials/metals that change the stats for each item.
Otherwise, you could also add a description, like Iron Plated Leather Armor, Reinforced Scale Mail or something of the sorts.Even Blessed Mail could fit with your lore I assume, wherever there are meddling deities, there are enchanted/blessed items.
As someone mentioned before, cultural armor would be important, as different cultures figh in different ways, say a culture that upholds honor, would probably reinforce the front of the armor and leave the backside exposed, giving it no consideration, while a "sneaky" culture, would do the opposite.
If you are planning on doing different protection for different body parts, then that could help with what I stated before, additionally, as a player you might reinforce your armor on certain parts, depending on how you fight.
Something else that I would like to add, although probably not many people will like it - how come every store owner has my *exact* size of armor? If we're talking about a ravaged world, armor should be something expensive that you either craft yourself, or is tailored to your size.