In the Appearances collection, Fancifully Frilled Tunic is listed as Boss Drop. Appearance ID: 20243. 14 other items wear the same appearance; 9 of them are listed here.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Fancifully Frilled Tunic Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Fancifully Frilled Tunic 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
Fancifully Frilled Tunic is part of the transmog set Fire-Charm Vestments (Monk only). The other 16 pieces:
Blizzard numbers items as they are created, so the named items next to ID 95147 (95142 to 95152) were usually added in the same batch as Fancifully Frilled Tunic: the same quest line, zone, vendor or reward set.