The athlete turned heads in a bright yellow tennis dress with lattice work inspired by Alice in Wonderland at the Australian Open last year. “It's kind of about a surprise, because when Alice goes down the hole, the rabbit hole, she finds all these things that are so surprising,” Williams said of her ensemble before stepping on the court. “This outfit is about having a surprise in a tennis dress, and kind of, you know, showing some skin and then just having a print. Prints don't happen that often in tennis. So it's called the Wonderland dress. It was fun."