From the topic Armor sets (DKS).;

Defenders of Aleroth
Weapon[spoiler]Chest, Complete 3 Prophecies from Sosostra - Broken Valley

Helmet
Trader Locke, Buy it - Black Boar Inn. (Broken Valley Village)

Armor
Trader Carlin, Buy it - Top of Lovis' tower (Broken Valley)

Leggings
Loot, Defeat Red orb challenge - West of Quarry Shrine (Broken Valley)
[/spoiler]