Glamours: Re-work the entire system.
If 200 wasn't enough, and 400 isn't enough, 800 won't be enough:
Then clearly the system is flawed.
Completely re-work the glamour system to work more like World of Warcraft's Transmog system. Then no one has to worry about adding anything at all to a glamour dresser. Have the new system automatically add what people have in their glamour dressers into the new system.
No more clogging up dresser space, no more bloated strain on the system. It's obvious the system itself is outdated, so update it properly. The space increase is just a band-aid on a gushing wound. It's not going to hold.
EDIT: If you really want to make the playerbase happy, take away role restrictions on gear. Once a piece of gear goes into the collection, ANY class can use the gear. The only restrictions that should remain are for racial gear, weapons, and artifact gear. Everything else should turn into a level 1, Any Class glamour item. So what if your tank wants to wear a dress: I already have to stare at naked Roegadyn wearing a Chocobo head while they tank.
So what if the black mage wants to wear plate armor? A battle mage sounds AMAZING. Let them do it.