I am working on expanding the mundane armors list, and this is what I have come up with so far, if this helps. Mostly light armors, a couple medium, and one heavy which is a more flexible at the cost of an AC platemail, removing the disadvantage on stealth in exchange for a 17 ac base. Think samurai armor. Not 100% this is what you're looking for, but I too was looking to expand armor (and weapon) options to be more diverse and representative of historical armors across more than just European cultures, so I figured I'd throw it up for you. I can also add the weapons if you want, but both the weapon and armor tables are merged into a single document which I can also attach later if you'd like.
View attachment New Mundane Armors.docx
Edit: You could also make the armors out of special materials, for instance, the hide armor could be made of dragonhide (or another similarly tough beast), or that it is made from a more flexible material that would let you use more of your dex (at the cost of being priced higher, obviously). Like, for instance, say that mithral half-plate lets you use dex up to +3 (or 4, or 5, whatever, your game, do whatever), or that you can get rhino-hide studded leather and it's 13+dex, or something along those lines. It's a fantasy game so hell you could say that there's an amulet that creates a suit of full plate out of force that lets you have the 18 ac of full plate but still apply your dex bonus to AC. If you're playing, it'd probably be a tough sell for a DM, but some kind of wondrous item that puts up a mage armor effect (base 13+dex+shield+misc) in lieu of actual armor wouldn't be too powerful. Hell, lizardfolk, dragon sorcs, warlocks, and wizards all have access to a 13+fulldex ac calculation, that doesn't break the game, so an item that does it shouldn't break anything either. Just depends on the style of game you play.