If only we can get a glamour book which works similar to the cut scene book at the inn, this could help lighten the inventory space issue. Well, at least for the people like me who are overloading their retainer with glamour gears.

Just give us a book that contains the address to all the gears in the game, and when we obtain say, gear X, it will unlock gear X entry in the glamour book, enabling us to glamour gear X even after we discarded the physical gear. We can still keep the glamour prism, but instead of glamouring gear Y using gear X, we now glamour gear Y using the unlocked gear X entry from the glamour book instead.

This can also solve the issue of multi-stage items like relics, levi, sol and poetic weapons.