This WoW set features the full Redemption Armor transmog, which is the paladin tier 3 raid set. Redemption 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 paladin tier 3? By bidding for the pieces on the BMAH.
How many set pieces?  Helmet, Shoulders, Chest, Bracer, Hands, Belt, Pants, and Feet.
Paladin Tier 3 Transmog:
Head: Redemption Headpiece by purchasing the helmet from the BMAH.
Chest: Redemption Tunic by purchasing the chest from the BMAH.
Wrist: Redemption Wristguards by purchasing the bracers from the BMAH.
Hands: Redemption Handguards by purchasing the gloves from the BMAH.
Waist: Redemption Girdle by purchasing the belt from the BMAH.
Legs: Redemption Legguards by purchasing the pants from the BMAH.
Feet: Redemption Boots by purchasing the boots from the BMAH.