Speaking of accessories: When Thom Browne was developing his new running shoe with Asics, he started where he always does. “It needed to work perfectly with that gray suit,” Browne tells me. The resulting trainer marks the designer’s very first sneaker collaboration. “I never really wanted to do it,” Browne says, matter-of-fact as ever. (He famously prefers a polished black wingtip.) In the 25 years since Browne, 60, recast American menswear with a radically shrunken version of the classic salaryman suit, the relevance of the luxury-sneaker collab has oscillated wildly, rising and falling along with practically every other trend under the sun. But the Thom Browne look—with its extreme yet exacting proportions—has remained singular and striking. Browne likes to say that his gray suit never gets old—and, indeed, he’s regularly using runway shows and other public moments to remind everyone about his most influential design. “I always feel like I want to make sure that people see my collections are always evolving, but [also] that they’re always staying true to where they started,” Browne says. …