Not sure, but sure looks like Topsy Turvy designs to me…

Love these book cover designs by Megan Wilson, for Dashiell Hammett’s novels. If you like book cover designs like I do, you’ll love The Book Cover Archive.

From Wikipedia: “Paul Poiret (20 April 1879  – 30 April 1944) was a French fashion designer. His contributions to twentieth-century fashion have been likened to Picasso’s contributions to twentieth-century art. Though perhaps best known for freeing women from corsets and for his startling inventions including hobble skirts, “harem” pantaloons, and “lampshade” tunics, Poiret’s major contribution to fashion was his development of an approach to dressmaking centered on draping, a radical departure from the tailoring and pattern-making of the past. The structural simplicity of his clothing represented a “pivotal moment in the emergence of modernism” generally, and “effectively established the paradigm of modern fashion, irrevocably changing the direction of costume history.”