The Cosmetic Armor Reworked mod allows you to wear two sets of armor, one for display and one for protection. The mod also gives you the option to completely hide the armor so that you can show-off your cool Minecraft skin while still having the protection that your armor set provides. The armor that you use for cosmetic purpose will not have any effect on you. It will not reduce damage or stop attacks. When the player is killed, the cosmetic armor will drop. But you have the option to change that using the configs so that your cosmetic armor stays on even after you die. I find myself using this mod to show-off the shiny texture of the gold armor set while having my netherite armor protect me.

This is a Forge mod and download links are given below,

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Cosmetic Armor Reworked Mod