I came up with this idea because I feel that the current wardrobe and character creation preview systems, while great, still feel somewhat incomplete. And this is mostly because the two sides are not interlinked very well. I thought it would be cool to have a system where we could preview both character creation changes and wardrobe items on our characters at the same time, so we could better plan our customization, and that's when the idea of a "Change Room" came to me.
How it would work:
Basically, what you'd do is implement a change room area somewhere in LA that players can enter freely (or perhaps it could be a building with multiple change rooms, so you don't have too many players fighting for space). When a character enters this room, they can interact with different NPC's (one for character creation and one for wardrobe items like weapons or armor) and then customize their characters as they see fit, including the ability to apply any dye. All changes made to the character can then be saved and the character would take on the desired appearance, weapons, armor and all, and retain that appearance until they either alter it, or leave the change rooms.
The benefits of a Change Room system:
The main benefit of this kind of system would be the ability to see your character with a new look in the actual game world as opposed to the character screen, and because you are previewing both character customization changes and wardrobe items at the same time, along with dyes, it makes it easier to plan your complete look through one easy system. The other benefit is that your friends or peers would also be able to preview your ideas, and in a manner similar to how you'd perhaps present yourself in a fashion store and get the advice of your friends on your new wardrobe selection, you can get feedback from your friends on your customization ideas in game without having to send screenshots, etc.
Additional functionality could also be added, like the ability to save appearance ideas for future reference, or a "wardrobe planner" that tracks your progress on attaining the items used in your preview, until your look is complete.
All-in-all, I really like the idea, and I think it would benefit both ANet and players alike.