Corey Seymour

When Marta Kostyuk walked out onto Wimbledon grass for her opening-round match against Rebecca Šramková this morning, she did so wearing the Wilson tennis dress that seems destined to set the hearts of the tournament’s style-watchers aflutter. What’s immediately apparent is that Kostyuk’s sleeveless, deep-V-neck, largely open-backed dress—in, of course, Wimbledon white—is a picture of grace and elegance. Maybe less obvious? It’s also one of the most technical tennis dresses ever made—and it’s al…