Read from the World of Warcraft client build files.
How Forged Gladiator's Drape Compares
Who It Suits
Forged Gladiator's Drape carries Agility or Strength or Intellect, the primary stat of Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Beast Mastery, Marksmanship and Survival Hunter; Assassination, Outlaw and Subtlety Rogue; Discipline, Holy and Shadow Priest; Blood, Frost and Unholy Death Knight; Elemental, Enhancement and Restoration Shaman; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter; Devastation, Preservation and Augmentation Evoker.
Transmog Sets
Forged Gladiator's Drape is part of the transmog set Forged Gladiator's Leather Armor (Demon Hunter 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 Forged Gladiator's Drape Fits
Other Items Named Forged Gladiator's Drape
8 other items in the current build are also called Forged Gladiator's Drape. 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 218553 (218548 to 218558) were usually added in the same batch as Forged Gladiator's Drape: the same quest line, zone, vendor or reward set.