As a veteran player who firmly believes glamours are the true endgame, the glamour system seems to be very outdated when you consider the sheer amount of different gear sets there are.
If you take alt classes and crafting into consideration, you can easily fill two retainers with just glamour items. I don't know how often this suggestion is made, or if it is even taken into account, but I'd think having some form of glamour bank to save those for later use.
In short, just like recycling, I'd suggest the ability to destroy equipment in order to save it's appearance and keep it in an interface that lets you tab and organize everything. It would still mean the use of prisms. With crafting/gathering/alt classes, there is still quite enough actual equipment to use.
Hell, you could even make achievements related to that, and it would give all the more reason for players to revisit old content in order to fill out their collections. Win-win-win?