Williams sported a black bodysuit, telling Tennis Channel's Jon Wertheim the wardrobe was meant to inspire women who were recovering from a pregnancy:
She provided further explanation on Twitter:
Shortly after giving birth to her daughter, Williams suffered blood clots, an issue that predated her pregnancy. She explained to the BBC's Saj Chowdhury how a form-fitting bodysuit can be practical during a match.
"I had a lot of problems with [blood clots]—I don't know how many I have had in the past 12 months," she said. "It definitely has little functionality to it. It's a fun suit, but it's also functional so I'm able to play without any problems."
Williams has played a limited schedule in 2018 while easing her way back following her pregnancy. As a result, she's unseeded in the French Open. The 36-year-old has a tricky matchup with 17th-seeded Ashleigh Barty in the second round.