Read from the World of Warcraft client build files.
How Otherworldly Leather Mantle Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Otherworldly Leather Mantle suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Transmog Sets
Otherworldly Leather Mantle is part of the transmog set Doomblade Battlegear (Rogue only), which the Appearances collection lists in 4 versions. The other 16 pieces:
Items Numbered Next to Otherworldly Leather Mantle
Blizzard numbers items as they are created, so the named items next to ID 247532 (247527 to 247537) were usually added in the same batch as Otherworldly Leather Mantle: the same quest line, zone, vendor or reward set.