Read from the World of Warcraft client build files.
How Cosmic Gladiator's Cloak Compares
Who It Suits
Cosmic Gladiator's Cloak carries Agility or Strength or Intellect, the primary stat of Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Beast Mastery, Marksmanship and Survival Hunter; Assassination, Outlaw and Subtlety Rogue; Discipline, Holy and Shadow Priest; Blood, Frost and Unholy Death Knight; Elemental, Enhancement and Restoration Shaman; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock; Brewmaster, Mistweaver and Windwalker Monk; Balance, Feral, Guardian and Restoration Druid; Havoc, Vengeance and Devourer Demon Hunter; Devastation, Preservation and Augmentation Evoker.
Transmog Sets
Cosmic Gladiator's Cloak is part of the transmog set Cosmic Gladiator's Chain Armor (Hunter only), which the Appearances collection lists in 2 versions. The other 16 pieces:
Blizzard numbers items as they are created, so the named items next to ID 186780 (186775 to 186785) were usually added in the same batch as Cosmic Gladiator's Cloak: the same quest line, zone, vendor or reward set.