Read from the World of Warcraft client build files.
How Harpy-Hunter's Gloves Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Harpy-Hunter's Gloves suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Similar Items
The 10 items nearest to Harpy-Hunter's Gloves (item level 50) in item level among Armor > Leather, Hands slot, from item level 39 to 60.
Blizzard numbers items as they are created, so the named items next to ID 139601 (139596 to 139606) were usually added in the same batch as Harpy-Hunter's Gloves: the same quest line, zone, vendor or reward set.