In Wrath of the Lich King it is item level 226, requires level 80 and is named Dreamwalker Vestments. In MoP Classic it is item level 213 and requires level 80.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Valorous Dreamwalker Vestments Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Valorous Dreamwalker Vestments 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
Valorous Dreamwalker Vestments is part of the transmog set Valorous Dreamwalker Battlegear (Druid only). The other 16 pieces:
Items Numbered Next to Valorous Dreamwalker Vestments
Blizzard numbers items as they are created, so the named items next to ID 40469 (40463 to 40474) were usually added in the same batch as Valorous Dreamwalker Vestments: the same quest line, zone, vendor or reward set.