Read from the World of Warcraft client build files.
How Sea-Treated Shoulderguards Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Sea-Treated Shoulderguards 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
Sea-Treated Shoulderguards is part of the transmog set Arinor Keeper's Leather Armor (Rogue, Monk, Druid and Demon Hunter only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Sea-Treated Shoulderguards Fits
Other Items Named Sea-Treated Shoulderguards
1 other item in the current build is also called Sea-Treated Shoulderguards. 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 153379 (153374 to 153384) were usually added in the same batch as Sea-Treated Shoulderguards: the same quest line, zone, vendor or reward set.