In Wrath of the Lich King it is item level 213 and requires level 80. 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 (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Deadly Gladiator's Satin Robe Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Deadly Gladiator's Satin Robe suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Similar Items
The 10 items nearest to Deadly Gladiator's Satin Robe (item level 35) in item level among Armor > Cloth, Chest slot, from item level 32 to 37.
Items Numbered Next to Deadly Gladiator's Satin Robe
Blizzard numbers items as they are created, so the named items next to ID 41920 (41914 to 41926) were usually added in the same batch as Deadly Gladiator's Satin Robe: the same quest line, zone, vendor or reward set.