BackAccessory is a comma-separated list of asset IDs that determine what accessories should be added when the description is
Humanoid/ApplyDescription|applied. The list is kept sorted in descending order without duplicates.
Any accessory can used in this property, even if it is meant to go in a different accessory spot. For example, an accessory meant to go on your back (such as a cape) could be included in
HumanoidDescription/HairAccessory|HairAccessory. An error is thrown if you try to apply a new description which shares any assets with the existing description but a different accessory property.
articles/HumanoidDescription System, for more information on HumanoidDescriptions
HumanoidDescription/WaistAccessory|WaistAccessory, which are similar properties that apply accessories like this one