This image shows the transmog system from World of Warcraft.
It's very simple and doesn't need as much space like the existing glamour system in FF14.
All it does is this:
1 Lists all the items you can glamour in the game - into categories e.g. helms, chest, weapons
2 Highlights and adds a tick if you own the item - either already in glamour dresser or inventory, unowned / uncollected items will be greyed out
3 If you get a new item, a message will appear "This item is added to glamour dresser" - if it's tradeable, it will remain till traded (Like in WoW - it gets removed once traded even if it said unlocked), best bet is to equip then sell.