there are 4 slots open on the right side atm and the top mask on the right, thats 5 slots total that could be used for lower body, upper body, shoes, gloves, hat.
If you moved the "helmet equip" slot from the top of left to top of right, than effectively everything on the right hand side would be "equipment" aside of your "shirt, pants, necklace, gloves and shoes" on the left side. If you moved these all to the bottom, it would give you 5 slots on the top you could use for "vanity" skin slots that could cover the whole body.
For example if you equipped a "upper body skin" you could disable the visuals of everything on the top half of the torso, same thing with the "lower body skin" could disable the visuals of everything on the bottom half of the torso. Again gloves and boots disabling the visuals of their matching counter part, again with helmet as well.