As you climb to the tower, you will encounter a few Erynias that may attack. The armor diagrams are located in an unmarked location, an old signal tower south of the Kaer Morhen signpost. They will reveal there are six diagrams in total: four armors and two swords, all located in Kaer Morhen. To begin the hunt for the Wolf Gear, buy the Slightly Torn Notes by Hieronymus, purchasable from Lindenvale's Blacksmith.