VanitySlots
The VanitySlots mod enhances character customization in Minecraft by adding four special slots for decorative armor. These additional slots are integrated through the Trinkets API system and allow you to choose your armor's appearance regardless of what you're actually wearing.
Now you can create unique looks for your character without sacrificing the protective properties of your main equipment. Simply place the desired armor in the visibility slots, and it will be displayed on your character.

Additionally, the mod includes four special armor pieces that completely hide your current equipment. To craft them, place leather armor in the center of the crafting table and surround it with eight glowstone dust particles.

An interesting feature is that enemies react to visible armor rather than what you're actually wearing. For example, if you place golden armor in the visibility slot, piglins won't attack you. When using a full set of familiar armor with invisibility status, mobs won't be able to detect you from a distance. Please note that this feature is disabled by default.
A demonstration video is available to visually explore the mod's capabilities. The video also shows compatibility with other mods, particularly with Astromine.