Read from the World of Warcraft client build files.
How Harlan's Shoulders Compares
Who It Suits
Mail is the armor type Evoker, Hunter and Shaman wear. With Agility or Intellect, Harlan's Shoulders suits Beast Mastery, Marksmanship and Survival Hunter; Elemental, Enhancement and Restoration Shaman; Devastation, Preservation and Augmentation Evoker.
Transmog Sets
Harlan's Shoulders is part of the transmog set Mogu Lord's Regalia (Hunter, Shaman and Evoker only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Harlan's Shoulders Fits
Other Items Named Harlan's Shoulders
2 other items in the current build are also called Harlan's Shoulders. 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 81698 (81693 to 81703) were usually added in the same batch as Harlan's Shoulders: the same quest line, zone, vendor or reward set.