Read from the World of Warcraft client build files.
How Netherfiend Breeches Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Netherfiend Breeches 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 Netherfiend Breeches (item level 13) in item level among Armor > Leather, Legs slot, from item level 8 to 19.
Emblazoned Leggings has the highest item level here (19). The lowest listed price among them is Light Leather Pants at 20 silver in the US Auction House.
Blizzard numbers items as they are created, so the named items next to ID 240558 (240553 to 240563) were usually added in the same batch as Netherfiend Breeches: the same quest line, zone, vendor or reward set.