Venus Williams (left) and Serena Williams during their French Open doubles first round match against Japan's Shuko Aoyama and Miyu Kato in Paris yesterday. Pic/AFP

Kristyna Pliskova who was beaten by Serena Williams who wore a black catsuit on Tuesday, questioned the legality of the outfit when she talked with Czech media. "I was wondering if it was in the rules," the Czech said. "I don't even know what material it is, it looks like neoprene. They should follow the rules, otherwise play in the nude." Serena said the suit was inspired by the Black Panther movie blockbuster and made her feel like a 'super hero'.