In TileData, create a new blank item, name it and tick 2 options: Wearable, Animation. Quoting within the script, e.g.:
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public class Horse : BaseMount
public Horse ( string name ) : base( name, 172, 0x7fee, AIType.AI_Mage, FightMode.Closest, 10, 1, 0.3, 0.5...