Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Slayer's Legguards Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Slayer's Legguards 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
Slayer's Legguards is part of the transmog set Slayer's Armor (Rogue only). The other 9 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Slayer's Legguards Fits
Other Items Named Slayer's Legguards
1 other item in the current build is also called Slayer's Legguards. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Leggings of The Black FlameID 137068 · Armor - Leather · item level 50"The Black Flame specializes in providing the finest services and entertainment money can buy, whether they..."
Blizzard numbers items as they are created, so the named items next to ID 150564 (150559 to 150569) were usually added in the same batch as Slayer's Legguards: the same quest line, zone, vendor or reward set.