Read from the World of Warcraft client build files.
How Felreaper Vest Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Felreaper Vest 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
Felreaper Vest is part of the transmog set Felreaper Vestments (Demon Hunter only), which the Appearances collection lists in 4 versions. The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Felreaper Vest Fits
Other Items Named Felreaper Vest
1 other item in the current build is also called Felreaper Vest. 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 247152 (247147 to 247157) were usually added in the same batch as Felreaper Vest: the same quest line, zone, vendor or reward set.