The accessory system is a new system implemented with the Aether mod.
The first column is used for armor, indicated by icons. In the second column, there are the slots for the Pendant, Cape and Shield. These three are obtainable via dungeons. The last column is used for Rings and Gloves, both of which are craftable.
Armor Sets[]
New Armor Slots[]
Miscellaneous[]
External Links[]
Saddle, in the Minecraft Wiki.