Helm: Radiant Gold Mask

Armour: Goldmask's Rags

Gauntlet: Gold Bracelets

Leggings: Gold Waistwrap

Where To Find: 

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

The helmet can be discovered in Altus Plateau, positioned on a section of a collapsed bridge northeast of Writheblood Ruins. The remaining parts can be obtained from Goldmask's body upon the completion of Brother Corhyn's questline.