Wikia

Cadaverous Garb is the leather Scholomance instance set.

Source

Each piece can be dropped by the six Bosses before Darkmaster Gandling in Scholomance:

Cadaverous Garb
Cadaverous Armor Item Level 61 Binds when picked up Leather Chest 172 Armor +8 Agility +8 Strength Durability 100 / 100 Requires Level 56 Equip: Increases attack power by 60. Sell Price: 2 41 89 Set: Cadaverous Garb (1/5)	Cadaverous Belt Item Level 61 Binds when picked up Leather Waist 97 Armor +12 Stamina Durability 35 / 35 Requires Level 56 Equip: Increases attack power by 40. Sell Price: 1 20 48 Set: Cadaverous Garb (1/5)	Cadaverous Leggings Item Level 61 Binds when picked up Leather Legs 150 Armor +18 Stamina Durability 75 / 75 Requires Level 56 Equip: Increases attack power by 52. Sell Price: 2 42 82 Set: Cadaverous Garb (1/5)	Cadaverous Gloves Item Level 61 Binds when picked up Leather Hands 107 Armor +9 Stamina Durability 35 / 35 Requires Level 56 Equip: Increases attack power by 44. Sell Price: 1 22 33 Set: Cadaverous Garb (1/5)
Cadaverous Walkers Item Level 61 Binds when picked up Leather Feet 118 Armor +20 Stamina Durability 50 / 50 Requires Level 56 Equip: Increases attack power by 24. Sell Price: 1 84 20 Set: Cadaverous Garb (1/5)