"More glamour plates" is a bandaid fix. Gut the glamour system entirely and replace it with something similar to WoW's transmog system.

There should not be a limit on the number of items that can be stored in the glamour dresser. The game should track every item that you've collected the appearance of, and you should be able to collect the appearance of every item simultaneously. Glamour plates should be stored locally, if necessary, and unlimited.