Read from the World of Warcraft client build files.
How Crimson Gladiator's Leather Jerkin Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Crimson Gladiator's Leather Jerkin 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
Crimson Gladiator's Leather Jerkin is part of the transmog set Crimson 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 Crimson Gladiator's Leather Jerkin Fits
Other Items Named Crimson Gladiator's Leather Jerkin
3 other items in the current build are also called Crimson Gladiator's Leather Jerkin. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Items Numbered Next to Crimson Gladiator's Leather Jerkin
Blizzard numbers items as they are created, so the named items next to ID 201569 (201564 to 201574) were usually added in the same batch as Crimson Gladiator's Leather Jerkin: the same quest line, zone, vendor or reward set.