As Milan Fashion Week has unfurled, we’ve seen a heavy ripple of early-to-mid 20th-century aesthetic nods anchored (in this writer’s opinion) by Frida Giannini’s essence-of-the-sixties spectacular at Gucci. Yet further scanning (prompted by about 100,000 Instagrams of Prada’s angular shoes earlier today) reveals artistic cues from prior decades, namely that transitive amorphous zone between Cubism and Art Deco, circa the 1910s to the 1940s.