Read from the World of Warcraft client build files.
How Obsidian Gladiator's Leather Vest Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Obsidian Gladiator's Leather Vest 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
Obsidian Gladiator's Leather Vest is part of the transmog set Obsidian 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 Obsidian Gladiator's Leather Vest Fits
Other Items Named Obsidian Gladiator's Leather Vest
3 other items in the current build are also called Obsidian Gladiator's Leather Vest. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Obsidian Gladiator's Leather Vest
Blizzard numbers items as they are created, so the named items next to ID 205521 (205516 to 205526) were usually added in the same batch as Obsidian Gladiator's Leather Vest: the same quest line, zone, vendor or reward set.