People often argue that clipping is an issue for capes, however since I’ve learned that ArenaNet uses Havok Cloth in their engine there should be no problem implementing them into the game.
To boot, they could also be a PvP-exclusive reward. What better way to draw people to PvP than to introduce skins wearable in PvE and PvP solely obtainable via PvP?
~Tired and thinking out loud,
Ferrum. Charr have voiced their opinions.