Originally Posted by
The Mister Madgod
Aquamonkey you're good at ferreting out quotes! I want to say that Doomhammer got his armor somewhere in the second half of RotH but I don't have the book on me. Think you might be able to find it?
Orgrim was equipped with the orcs' first attempts at heavy armor when they attacked a hunting party near Telmor.
The Blackrock clan, with Blackhand himself in the vanguard, had begged for the honor of being the first to strike. There had been some resentment and grumbling, but the hunting skills of the Blackrock were legendary, and they were logical first choice as they also lived fairly near Telmor, one of the smaller, more isolated cities. They had been given the first efforts at armor, swords, metal-tipped arrows, and other weapons of war that would bring down the draenei.
Orgrim, the Doomhammer strapped across his back and clad from head to foot in metal that made him chafe and feel confined, rode at his chieftain’s side. The wolf beneath him seemed to have an equal dislike of the heavy armor, and now and then turned his massive head to snap at Orgrim’s leg, as if at some insect that annoyed him. He also seemed to be laboring a bit as he bore his rider across the soft meadow grass, panting more than usual, pink tongue lolling.
--Rise of the Horde, ebook p. 185
Whether or not that was his iconic armor, I don't know. But if it's not, that would have to come later as they improved their armorsmithing.