In Wrath of the Lich King it is item level 226, requires level 80 and is named Dreamwalker Mantle. In MoP Classic it is item level 213, requires level 80 and sells to vendors for 1c.
Read from the World of Warcraft client build files.
How Valorous Dreamwalker Mantle Compares
Who It Suits
Leather is the armor type Demon Hunter, Druid, Monk and Rogue wear. With Agility or Intellect, Valorous Dreamwalker Mantle suits Assassination, Outlaw and Subtlety Rogue; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter.
Items Numbered Next to Valorous Dreamwalker Mantle
Blizzard numbers items as they are created, so the named items next to ID 40470 (40465 to 40475) were usually added in the same batch as Valorous Dreamwalker Mantle: the same quest line, zone, vendor or reward set.