InvisArmorMod
About
A client-side Fabric *.21.4 mod that dynamically toggles the player's invisibility based on armor state. When wearing any armor piece, the player appears visible. When completely unarmored, the player becomes invisible. Uses a client-only mixin into PlayerEntity.isInvisible() — no server-side changes needed. Also affects mob targeting, making unarmored players invisible to hostile mobs.