The Chinese theme of the Ermenegildo Zegna show was writ large on Saturday. You’d think it was the 3D-filmed Great Wall of China out of which the models walked, or the Chinese silk evening wear (think Shantung tuxes) that brought out the Asiaphile in me, but no: It was the karate shoes. Yes, Zegna made a luxury version of the canvas slip-ons worn in tai chi parks the world over. In rich coffee and caramel-colored calfskin. Awesome. Each pair’s sole matched the look it went with, many of which shared that feeling of luxurified utility.