Even a fantasy set in a historical time period requires research -- and as I am working through Zizola's novel (the sequel to The Innamorati) I am delighted to come across research like this -- which just provides so much wonderful visual information. Plus, it's also very cool to have such dedicated historians going through the process of recreating -- as was once done -- the clothing of the time.
The source of this material as Dr. Rublack discusses in the video (and about which a good deal more can read here) is all from one man, a 16th century German accountant and Renaissance sartorialist, Matthäus Schwarz, who succeeded in moving up the social circles in part by knowing the latest fashions and dressing well. He produced carefully drawn and painted portraits of all of his significant clothes throughout his life -- giving historians a remarkable close up on the well dressed man during different ages and stations of his life. Plus, the art is really rather lovely. To see more, check out this other terrific article on Schwarz (at Res Obscura) with many images of his journal of clothing.