Instead of a paid DLC map, why not this...which would allow you to keep your word to the community?

[CodeMage]

@Thea

Cause that would ruin PVP.

Not necessarily. I posted my wish for cosmetic armors in the Question of the Week thread and I included a way to make it not ruin PVP:

@CodeMage

Cosmetic armor slots. Add a second set of armor slots on the character paper doll. If filled, other players see you wearing armor in those slots, instead of your real armor, if they have their settings configured to see cosmetics. Give players three options in their settings: 1) always see cosmetics, 2) always see real armor, or 3) let it be controlled by the server. PVP and PVE-C servers would have it “always real” by default.

The same logic can be used for any cosmetic additions like that.