Helm: X

Armour: Bloodsoaked Tabard

Gauntlet: Foot Soldier Gauntlets

Leggings: Foot Soldier Greaves

Where To Find: 

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

The Bloodsoaked Tabard is dropped by Mausoleum Foot Soldiers. However, the other parts of the set can only be obtained by defeating Godrick Foot Soldiers.