This WoW set features the full Bonescythe Armor transmog, which is the rogue tier 3 raid set. Bonescythe 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 rogue tier 3? By bidding for the pieces on the BMAH.
How many set pieces?  Helmet, Shoulders, Chest, Bracer, Hands, Belt, Pants, and Feet.
Rogue Tier 3 Transmog:
Head: Bonescythe Helmet by purchasing the helmet from the BMAH.
Chest: Bonescythe Breastplate by purchasing the chest from the BMAH.
Wrist: Bonescythe Bracers by purchasing the bracers from the BMAH.
Hands: Bonescythe Gauntlets by purchasing the gloves from the BMAH.
Waist: Bonescythe Waistguard by purchasing the belt from the BMAH.
Legs: Bonescythe Legplates by purchasing the pants from the BMAH.
Feet: Bonescythe Sabatons by purchasing the boots from the BMAH.