It's a fun suit, but it's also functional so I'm able to play without any problems.
Speaking on court after the match, a jubilant Williams said: "I lost the first set and I just though I have to try harder".
But Williams seems to be eyeing the chance to break the world record of 24 Grand Slam wins now held by the Australian tennis star, Margaret Court.
"When I left the match, I was with my father at the time, I said, "he's going to win and he might win a lot of Grand Slams behind that, because he was incredible", remembered Gasquet.
The 23-time Grand Slam champion will run into 11th seed Julia Goerges next and it will be interesting to see what kind of plan the German will bring into action.
And what a striking return it was, right down to the outfit - which called to mind the "catsuit" Williams wore at the 2002 US Open - and was paired with black high-top sneakers sprinkled with silver glitter.
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Williams also said the outfit helped her cope with the issue of blood clots, which she revealed, in February, nearly cost her life.
"It's not a typical outfit". But what's typical? Who makes the rules?, " she asked. I have been wearing trousers in general a lot when I play so I can keep, you know, the blood circulation going. I'm always living in a fantasy world.
"For all the moms out there who had a tough recovery from pregnancy-here you go", she wrote.
The world number one has openly admitted to struggling to cope with pressure of big matches in the past, but says she is feeling more relaxed on court. The same continued into the first game of the second set, and Serena was quickly broke.
But just as the half-full crowd, enjoying the late evening sunshine on Court Philippe Chatrier anticipated a quick kill, Williams came storming back, reeling off four straight games for 4-1.
However, it was Williams who made the fewer errors and secured the most important break to take a 4-3 lead before she sealed victory in the 10th game.
A fifth ace of the contest won her the set.