src/main/resources/assets/aether_legacy/recipes/yellow_cape.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "##",
    "##",
    "##"
  ],
  "key": {
    "#": {
      "item": "minecraft:wool",
      "data": 4
    }
  },
  "result": {
    "item": "aether_legacy:yellow_cape"
  }
}