This quest is not available in game.
Bring 12 Laughing Sister's Hairs to Kil'hala at the Crossroads.
For your services, I have arranged for the creation of your new robes, provided you can gather the needed materials...
For these robes, you must return to Ashenvale for the locks of hair from laughing sisters--dryads who gather near the Raynewood Retreat.
When you have their hair, bring it to Kil'hala, a troll tailor at the Crossroads in the Barrens. He will be expecting you, and will fashion your robes.