Mobs wearing armor trims  

Updated release for Minecraft 26.1.2 using Fabric

This mob allows naturally spawned mobs to wear trimmed armor.

Players can trim their armor using a smithing table...
... so why shouldn't the mobs do so as well?

Probablity can be modified in the mob_trims.json config file.
You can also exclude specific armor trim materials as well as patterns.

An example configuration would be:

{
  "probability": 0.75,
  "exclusions": {
    "materials": [],
    "patterns": [
      "minecraft:wild",
      "minecraft:vex"
    ]
  }
}

Armor on mobs will be trimmed with a 3/4 chance but wild and vex patterns would be excluded.