To don the colors of Ironforge in cloth armor, look no further than the Stormpike Emissary for inspiration!
The emissaries used to appear in the Alliance capital cities to recruit soldiers for their ongoing battle against the Frostwolf Clan in the Alterac Valley battleground, but they were removed from the game in 2014 when the random battleground feature was implemented.
It’s not possible to get the exact robe as above as the two known sources (High Robe of the Adjudicator and Enchanted Gold Bloodrobe) were removed from the game, but the Cindercloth Robe and Bloodwoven Wraps come pretty close and are easily obtainable. Pair it with a Stylish Red Shirt. Any generic brown gloves and boots will suffice. (The belt graphic is leather only, alas.)
Here’s my version with a few tweaks to the retro outfit:
Shoulders: Resilient Mantle
Chest: Cindercloth Robe
Shirt: Stylish Red Shirt
Belt: Veteran’s Silk Belt
Bracer: Earthmender’s Bracer of Shattering
Gloves: Manawracker Gloves
Boots: Sandals of Tainted Blood
Weapon: Crackling Staff (an Alterac Valley weapon)
For Khaz Modan!