Above that were three gold stars to reflect her updated total of major championships - the one she won on Saturday at Flushing Meadows and the pair from the French Open in 2020 and this June.
But if the young Polish sensation keeps playing and performing like this, if she manages to remain healthy and grounded, they're going to need to make a lot more new jackets for her.
Still just 21, yet already guaranteed to be a hall of famer, Swiatek has quickly established herself as a player no-one wants to face following the retirement of Australian great Ash Barty.Â
Especially in a final. Her 6-2 7-6 (7-5) victory over Ons Jabeur in Arthur Ashe Stadium gave her 10 consecutive triumphs in title matches, every one in straight sets.
And to think: this was not her favourite surface, not her favourite tennis balls, not her favourite weather, and not her favourite site.
Each of Swiatek's past three trips to New York had ended with third-round exits, and she'd arrived this time with few expectations and zero idea that it would be a two-week stay.
Which just all makes it that much more impressive.
As big as her forehand is, as skilled a returner as she is, as speedy and full of anticipation as her court coverage is, it's Swiatek's ability to think her way through the crucible of a match that might be her most valuable ability.
"I'm proud that I have much more solutions and options on court than I had before, tennis-wise, but also mentally," she said.
"I'm using these skills pretty well. I'm really proud of that, because I just know how it feels to not have ideas on court.
"It's been a long time since I didn't have any idea. So that's great. It shows that I'm actually doing progress."
But it's daunting for her challengers.
For Swiatek is 55-7 with seven titles in 2022, having shown she can win on the red clay of Roland Garros and on the hard courts, and amid the hubbub of Flushing Meadows.
She has an outstanding chance on hard courts at the Australian Open, where she made it to the semi-finals in January, or even on the grass at Wimbledon, even if she hasn't been beyond the fourth round there.
Asked what she's most excited about as she thinks about the future, Swiatek said she wants to see how, or whether, anything will be different now.
There will be more attention on her. There will be more away-from-tennis distractions.
"I'm going to see how I'm going to react," she said. "Winning the US Open is different than winning a slam in Europe or in Australia, because I don't know how the popularity thing is going to change, if it's going to change."
Then, with her latest trophy sitting in front of her, Swiatek offered this thought.
"For now, I'm kind of going to observe and learn. For the future, I know I still have a lot to improve on court. That's something that I'm excited for, because maybe it's just going to get easier to play these matches."
Easier? Look out.
Swiatek said this championship showed her "the sky's the limit."
She's right.
