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.
In the Appearances collection, Deadly Gladiator's Silk Raiment is listed as Vendor. Appearance ID: 10821. No other item uses this appearance, so it is unique to Deadly Gladiator's Silk Raiment.
Read from the World of Warcraft client build files.
Where Deadly Gladiator's Silk Raiment Comes From
Deadly Gladiator's Silk Raiment Drops From
The in-game Adventure Guide lists Deadly Gladiator's Silk Raiment in the loot of 1 encounter.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Deadly Gladiator's Silk Raiment Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Deadly Gladiator's Silk Raiment 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 Silk Raiment (item level 35) in item level among Armor > Cloth, Chest slot, from item level 32 to 37.
Items Numbered Next to Deadly Gladiator's Silk Raiment
Blizzard numbers items as they are created, so the named items next to ID 41951 (41945 to 41958) were usually added in the same batch as Deadly Gladiator's Silk Raiment: the same quest line, zone, vendor or reward set.