Read from the World of Warcraft client build files.
How Blightguard's Harness Compares
Who It Suits
Mail is the armor type Evoker, Hunter and Shaman wear. With Agility or Intellect, Blightguard's Harness suits Beast Mastery, Marksmanship and Survival Hunter; Elemental, Enhancement and Restoration Shaman; Devastation, Preservation and Augmentation Evoker.
Transmog Sets
Blightguard's Harness is part of the transmog set Blightguard's Chains (Hunter, Shaman and Evoker only), which the Appearances collection lists in 2 versions. The other 11 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Blightguard's Harness Fits
Other Items Named Blightguard's Harness
1 other item in the current build is also called Blightguard's Harness. 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 165480 (165475 to 165485) were usually added in the same batch as Blightguard's Harness: the same quest line, zone, vendor or reward set.