Helm: Diallos's Mask

Helm: Hoslow's Helm

Armour: Hoslow's Armor

Gauntlet: Hoslow's Gauntlets

Leggings: Hoslow's Greaves

Where To Find: 

(Click the link above to view the equipment and watch the getting video.)

Juno Hoslow drops the set along with Hoslow's Petal Whip as part of the final contract for the Volcano Manor Questline.

Completing Diallos's questline grants the player Diallos's Mask, which is an alternate headpiece missing the twin tails. Alternatively, the mask can be obtained earlier by killing Diallos when found in Liurnia of the Lakes.