In Wrath of the Lich King it is item level 226, requires level 80 and is named Dreamwalker Robe. 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 Robe Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Valorous Dreamwalker Robe suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Blizzard numbers items as they are created, so the named items next to ID 40463 (40458 to 40469) were usually added in the same batch as Valorous Dreamwalker Robe: the same quest line, zone, vendor or reward set.