I do not know how they added the capes/changed the model
That's easy. As they add the bit variable you're suppose to add when making multiple movesets, you also add a model changer event that goes with the bit variable. For example, when you make it so the bit variable activates during a taunt, you will also create another event that makes so a model appears after or when the it variable is activated. Or disappears when the bit variable is deactivated
