"The biggest difference is definitely I'm semi on time today", she said.
Williams said the catsuit was crucial for her health and well-being, claiming it prevented the return of blood clots which left her life in danger after she gave birth to daughter Alexis Olympia Ohanian in September past year.
The match between tennis' two comeback queens turned the instant Williams released a primal roar after blasting a backhand return victor after being broken in the opening game of the second set.
"I have definitely always had that will to win".
Williams played a awful game to hand over a break in the first game of the second set and she looked in big trouble at a set and a break down.
"Olympia needs a little sister, and then we can have a boy".
So it proved just over an hour later as Serena was roaring again and holding her arms aloft in triumph after setting up a third round showdown with Germany's 11th seed Julia Goerges.More news: Iran Foreign Affairs Minister Mohammad Javad Zarif arrives in India
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"I call it, like, my Wakanda-inspired catsuit", she said in an on-court interview in reference to the fictional nation in the record-shattering Marvel flick.
The potential third-round match-up with two-time Roland Garros champion Maria Sharapova was the first thing she spotted when she looked at the draw. After all, conventional wisdom is that the 23-time Grand Slam champion doesn't enter tournaments unless she thinks she has a chance to win.
Whatever happens over the next two weeks, Williams insists her family priorities have eased the expectations on her as a player.
The 23-time grand slam victor revealed the outfit was as much about functionality as style. Krystina Pliskova is a tough opponent who hits the ball hard, and it showed a good test for Serena's strength.
In the duo's only previous meeting, which happened at the 2014 Australian Open, Barty was beaten 6-2, 6-1.
"If I wasn't playing tennis, I'd be pregnant right now - sorry, I'm one of those women..."
"I feel like a super hero when I wear it".
Despite exercising before her return, Williams weighed 205 pounds.
And she credits her daughter as one of her major source of inspirations.