The drop rate is extremely low but you can still find it in the Auction House.
if you still want to farm this dress be aware that the mobs are hostile only to Horde characters according to the comments I found on Wowhead.
I am not quite sure I bought mine in the auction house.
Notes
- Side:
- Source: drop
- Level: —
- Binds: No
- Armor: Cloth
- Slot: Chest
