Implementation of chainmal armor/Change of armor system

What? I would like to suggest a change of the armor system, in order to implement the chainmail armor at least partially better into the game.

Why? As you can't craft chainmail armor and it isn't very good, it is in my opinion in survival a pretty useless armor type. But I think it would be cool to have it implemented in a useful way.

How? First of all the chainmail armor needs a crafting recipe. For that I would use the existing armor crafting recipe, but with chains as needed material. Now for the change in the armor system. When it was used IRL, armor plates were put above chainmail armor. There the chainmal armor was used to ensure flexibility. The inventory gets expanded by 4 additional armor slots similar to the second hand, only for helmet, chestplate, ... . This second slot would be used for the chainmail armor, and you could only put such in it. Furthermore you wouldn't be able to put chainmail armor in the main slots. But in order to use gold, iron, diamond or netherite armor you need to have a chainmail armor piece in the slot you want to use the the other armor. Why not leather armor? Because chainmail armor would need a fair bit of iron and you would probably have leather armor before chainmail armor. When ANY other armor is above the chainmail armor the chainmail armor doesn't get damaged so that it can't break. The chainmail armor would also give additional armor points. Of course the overall armor would have to get nerfed to keep it balanced.