Look closely at the Grunt on the left. He's wielding daggers. That's actually a rogue. Here's the all-leather Orgrimmar Grunt outfit. They're all random green drops, so check the Auction House!

Shoulders: Chest: Hands: Waist: Legs: Feet:

Cabalist Spaulders Sentinel Breastplate Sentinel Gloves Sentinel Girdle Sentinel Trousers Sentinel Boots