This WoW set features the full Dreadnaught’s Battlegear transmog, which is the warrior tier 3 raid set. Dreadnaught’s was orginally added in vanilla patch 1.11.0, then removed with the Naxxaramas revamp during Wrath of the Lich King, and finally made available once again in Mists of Pandaria via the Black Market Auction House.
How to get warrior tier 3? By bidding for the pieces on the BMAH.
How many set pieces?  Helmet, Shoulders, Chest, Bracer, Hands, Belt, Pants, and Feet.
Warrior Tier 3 Transmog:
Head: Dreadnaught Helmet by purchasing the helmet from the BMAH.
Chest: Dreadnaught Breastplate by purchasing the chest from the BMAH.
Wrist: Dreadnaught Bracers by purchasing the bracers from the BMAH.
Hands: Dreadnaught Gauntlets by purchasing the gloves from the BMAH.
Waist: Dreadnaught Waistguard by purchasing the belt from the BMAH.
Legs: Dreadnaught Legplates by purchasing the pants from the BMAH.
Feet: Dreadnaught Sabatons by purchasing the boots from the BMAH.