Japanese tennis superstar Naomi Osaka advanced to the second round of the US Open on Tuesday, wearing a ruffled sports dress that she said was inspired by magical girl fashion. It was Osaka’s first appearance at the event in two years.

Osaka worked with Nike and fashion designer Yoon Ahn to create two different looks for the US Open – one in black and one in green. Everything was designed in the style of magical girl anime and Japanese Lolita fashion, from the puffy ruffled skirts to the big, oversized bows.

“The inspiration for this look – and this could be a Japanese term – is that I feel like a ‘magical girl’ on the court,” Osaka said in a press release. “When I step on the court, it’s a moment of transformation for me and I have a lot of fun playing. So it’s a big motivation for me that everyone who sees the outfit experiences that feeling.”

Osaka doesn’t wear big skirts on the tennis court; the one with ruffles is specifically designed for performance, as is the jacket with the huge bow. Osaka wears a sporty tennis dress during her matches that also includes ruffles and bows. The look is thought out all the way down to her feet, where she wears socks and sneakers with bows. In an interview with the New York Times, Osaka described the fashion as “almost like a super suit.” Even her headphones, which she wore on the court, are decorated with ruffles and beautiful bows.

Sailor Moon is one of the most famous magical girl anime series and one of the most iconic ever. But Card Catcher Sakura seems to be more of an inspiration for Osaka’s look with its iconic dresses and large bows. Osaka’s black skirt with the ruffled underlayer is reminiscent of Sakura Kinomoto’s skirt in this series. The magical girl genre is known for its fashion, but especially for the role fashion plays in the characters’ powerful transformations.

“I really like the color green. I feel like it gives me peace and serenity. I think colors give you power,” Osaka told the New York Times. “For me, black is strength. For me, it’s the color of the super suit. I feel a bit like Black Panther.”