Z Zegna (the younger, more modern sub-brand of the Milanese menswear by Ermenegildo Zegna) has combined bespoke tailoring with state-of-the-art technology to create an activewear jacket that is as bold as the men who will undoubtedly wear it. The Z Zegna Icon Warmer Jacket—which was the highlight of the brand’s fall showcase—is a traditional outer shell, laced with heating panels designed to keep wearers warm during even the coldest of weather. Activated via a small switch in the pocket, the jacket dispels bur…