Did some more concepts. looking again at a lot of real life designs, these have elements influenced by a variety of asian and middle-eastern pieces from cultures like the Mughals. It’s difficult to come up with original designs that are practical, because most of the practical designs people came up with in the past were already made. Generally if you can think of a ‘unique’ design there is often a reason it wasn’t used historically. A major issue with a lot of fantasy armors is they are often impractical on or off the battlefield, sometimes both. Designing a bulky suit of armor to provide ultimate protection might work for its intended purpose but would be extremely heavy, hindering its user in combat. Not to mention something oft forgotten – you end up wearing a suit of armor out of battle much more than in battle. I doubt anyone would want to wear an extra 60-100lbs (or theoretically more in the case of many fantasy designs) any more than they had to especially when marching on foot, sitting down for dinner, etc. People in real life sure didn’t.
People tended to wear what they could get away with and what they could afford. Armor was expensive and difficult to manufacture, especially large plates of metal. European knights were often wealthy and could afford plate armor, the lower status footsoldiers and such as far as I know generally wore cheaper materials. Mail and lamellar was cheaper and easier to make than plate armor or more people would have used it. I’ve heard that some cannibalized common tools like scythes into helmets and such in emergencies which wouldn’t surprise me. Thick fabric is also much better at protection than many people think. If something was useless in real life it quickly died out, but even a crummy helmet is better than none at all.
Feudalistic societies don’t really exist in the current Motherland setting and the economics of resin production and crafting is different than that of metal (easier to create large sheets), but the general principle of cost and practicality is still very applicable. People are still people even in alien lizard land.