No I don't, because I haven't.
But seriously, this "Peach 2.0" agenda is getting annoying.
Rosalina's sports outfit is a modification of her normal gown.
Same colour scheme.
Similar "flowy" movements to her gown (Peach's doesn't move as dynamically, it's more stiff by comparison).
Same blueish-white strip on the bottom. Even curves upwards at the middle, like her gown does. They also made the bottom more frilly to further distinguish it from Peach's, not that it wouldn't without the frills.
They then added a collar (which has a more distinct look than Peach and Daisy's - their collars both look like flowers, only Daisy's is flat and Peach's sticks upward - Rosalina's doesn't look like a flower, it's more like a cosy pajama collar, which fits the nightgown theme of her normal outfit, and also has the same colour as the top part of her gown that rests on her shoulders), and pantyhose.
The only shared bit she has with Peach is the shoes, but so does Daisy. And shoes are just meant to be practical anyway, they don't need to look unique.
So yeah, Rosalina's outfit is based off her signature gown, not Peach's sports outfit.
To show the process:
Rosalina's normal outfit:
Fan concept for Rosalina sports outfit that is just a short, sleeveless version of her gown with thigh highs and trainers (posting this as a halfway point - I'm NOT saying Camelot took inspiration from this):
Actual sports outfit:
This isn't an opinion. If you can't see how it's literally a short version of her gown from this, then you're just reaching for the Peach comparison. This is objectively what they did.