Read from the World of Warcraft client build files.
How Swarmbringer Chestguard Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Swarmbringer Chestguard suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Swarmbringer Chestguard is part of the transmog set Swarmbreaker's Battleplate (Warrior, Paladin and Death Knight only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Swarmbringer Chestguard Fits
Other Items Named Swarmbringer Chestguard
2 other items in the current build are also called Swarmbringer Chestguard. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 81109 (81104 to 81114) were usually added in the same batch as Swarmbringer Chestguard: the same quest line, zone, vendor or reward set.