Read from the World of Warcraft client build files.
How Galactic Gladiator's Chestplate Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Galactic Gladiator's Chestplate suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Galactic Gladiator's Chestplate is part of the transmog set Galactic Gladiator's Plate Armor (Warrior only), which the Appearances collection lists in 3 versions. The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Galactic Gladiator's Chestplate Fits
Other Items Named Galactic Gladiator's Chestplate
2 other items in the current build are also called Galactic Gladiator's Chestplate. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Galactic Gladiator's Chestplate
Blizzard numbers items as they are created, so the named items next to ID 255589 (255584 to 255594) were usually added in the same batch as Galactic Gladiator's Chestplate: the same quest line, zone, vendor or reward set.