This WoW set features the full Valorous Redemption transmog, which is the paladin tier 7.5 (25-man) raid set. Redemption is obtained by looting Wrath of the Lich King bosses and purchasing some set pieces straight from the vendor with gold. Dropped tokens can be traded for set pieces via Dalaran tier vendors.
How to Get Pally Tier 7.5? By purchasing from vendors and slaying Naxxramas/Obsidian Sanctum bosses.
How Many Set Pieces?  Helmet, Shoulders, Chest, Hands, and Pants
Paladin Tier 7.5 Transmog: [25-Man Drop Locations]
Note: Paladins have three different sets with the same exact look. Tier 7.5 pally armor tokens can be used to purchase any of the set pieces.
Head: Crown of the Lost Conqueror [Kel’Thuzad] in Naxxramas
Chest: Breastplate of the Lost Conqueror [Gluth] in Naxxramas
Hands: Gauntlets of the Lost Conqueror [Sartharion] in The Obsidian Sanctum
Legs: Legplates of the Lost Conqueror [Purchase from Vendor] in Dalaran.
Shoulder/Leg Vendor (Alliance): Arcanist Ivrenne [37,55] in Dalaran.
Shoulder/Leg Vendor (Horde): Magistrix Lambriesse [65,23] in Dalaran.
Redeem Token Vendor (Both): Griselda Hunderland [46,28] in Dalaran.
Set Name: Valorous Redemption Battlegear (hover for set bonuses)
Shoulder: Valorous Redemption Shoulderplates
Chest: Valorous Redemption Chestpiece
Hands: Valorous Redemption Gauntlets
Legs: Valorous Redemption Legplates
Set Name: Valorous Redemption Plate (hover for set bonuses)
Shoulder: Valorous Redemption Shoulderguards
Chest: Valorous Redemption Breastplate
Hands: Valorous Redemption Handguards
Legs: Valorous Redemption Legguards