From what I can gather these "Falbalas and Fanfreluches" (translated as ruffles and frills) were pochoir portfolios published between 1922 and 1926 to showcase Georges Barbier's beautiful work. Apparently, only 600 editions were printed, so they are incredibly rare. Imagine finding one tucked away in the back of an antique bookstore! I think I'd faint!
All images from Panteek.com.