fantasysmp-cit/assets/fantasysmp/equipment/true_netherite.json

{
    "layers": {
        "humanoid": [
            {
            "texture": "fantasysmp:true_netherite"
            }
        ],
        "humanoid_leggings": [
            {
            "texture": "fantasysmp:true_netherite"
            }
        ]
    }
}