'in purple' is correct and usable in written English.
You may use this phrase when referring to any color that can be described as purple, such as lavender, lilac, mauve, or violet. Example sentence: The curtains in the living room were a deep shade of purple.
Exact(60)
In purple slacks.
He dressed in purple.
Marauders dressed in purple and black.
Ruling: Prince in Purple Rain.
I've never seen it before in purple!
"Dear Virginia," it said in purple ink.
Minneapolis lit up in purple lights.
Snoop Doggy Dog in purple and gold.
Wilde at his worst wrote in purple.
Men in purple or lemon suits.
Inside is Nao's diary, written in purple ink.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com