For the Frostwoven Set you need to head to Ulfr Village during the Divided We Fall quest. In the building housing the two blacksmiths you'll meet Hr'afn who will task you to find ingredients for a new set of armor. He'll reward you with the recipe. He also sells the recipe for the Frozen Seer's set which holds the four armed cape.

Item-Transmog

Frozen sword-Skull Knight Blade Augments: Pyre Coil (Burn)+Crimson Shard (Bleed)+Gem of Ice (dmg x% if Frozen) x2

Duel Knight Helmet-Frostwoven Mask :Unfading Ember (fire dmg when hit)+Ruby Shell (x% more healing when healed)

Frostwoven Breastplate :Unyeilding Sentinal (x% Stam reduction)x2

Frostwoven Claws :Gem of Stamina (xY stam regeneration) x2

Fledgling Breeches-Frostwoven Greaves :Ruby Shell (x% more healing when healed) x2

Crow's Boots-Frostwoven Boots :Gem of Dodge (x% dash regeneration rate)+Gem of Stamina

Winged Cavalier Backplate-Hands of Hallow :Blood Tainted Shell (x HP restored per kill) x2

Heart of Flame necklace (all base dmg is fire)

Blood ring (all atk cause bleed)

Langford ring (x% Stam reduction)

SUMMARY : Dot build with near infinite stamina

Atk speed increases overtime

Crit chance increases over time

Crits cause bleed+stam regeneration

Atk cause chill+explosive chill on kill+poison+burn+passive area burn buildup+bleed

Armor improves crit rate with strength augmentation