Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Invader's Firestorm Chestguard Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Invader's Firestorm Chestguard 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
Invader's Firestorm Chestguard is part of the transmog set Tuskarr Dungeoneer's Garb (Rogue, Monk, Druid and Demon Hunter only). The other 16 pieces:
Items Numbered Next to Invader's Firestorm Chestguard
Blizzard numbers items as they are created, so the named items next to ID 193764 (193759 to 193769) were usually added in the same batch as Invader's Firestorm Chestguard: the same quest line, zone, vendor or reward set.