and the funny part is that it could be implemented in such an easy way.....

two tabs Gear and Cosmetic

you would use all the same gear for both sections, but what ever is placed in the cosmetic tab will have all its stats disabled.

Gear requirements of class and job will still apply, but level would not.
gear in cosmetic slot would not take "damage".
if you dont have anything in a cosmetic slot, then that slot will show what ever you have in the gear tab slot.