Read from the World of Warcraft client build files.
How Mana-Saber Hide Jerkin Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Mana-Saber Hide Jerkin 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
Mana-Saber Hide Jerkin is part of the transmog set Battlegear of the Dreadhide Stalker (Rogue, Monk, Druid and Demon Hunter only). The other 16 pieces:
Blizzard numbers items as they are created, so the named items next to ID 134329 (134324 to 134336) were usually added in the same batch as Mana-Saber Hide Jerkin: the same quest line, zone, vendor or reward set.