For the design I let you do the job (cuz you are AWESOME! ), but for the slots, I would prefer if each one has a field of functionality.
Items on the ankles for example could effect the movement and/or stabillity (Speed up, Boost, Endurance, Jumping, Swimming, Climbing, ...).
Wrist ones could handle interaction with items and stuff arround the player (faster attack, stronger attack, pushing people, more building range, more pick up range, ...)
Chest items would be of a defensive function (self healing, protection from elements, pushing back anyone who hits you, reflexting projectiles, reducing impact, ...)
The Back ... well, the back ... I just throw some ideas into the room ^^ (More inventory space, Cloak for hiding, cape of gliding, glowing in the dark (for miners), humming for calling animals to your position (good for hunting and taming). ) .... Let's say the back supports the gamestyle of the player