Diagram: Grandmaster Feline armor

This diagram is found by interacting with a painting at Bartolomé de Launay's residence during the quest, Scavenger Hunt: Grandmaster Feline Gear, which is started after meeting and talking with Lazare Lafargue about finding grandmaster gear for 5 of the witcher schools.

With a New Game +, this diagram is replaced with the grandmaster legendary version.