Sweater weather is a state of mind.

Taylor Swift returned to one of her longtime favorite labels to catch Cara Delevingne’s penultimate performance in “Cabaret” in London last Friday, wearing a sky blue Stella McCartney sweater ($1,690) with a fringed hem.

Taylor Swift wore Stella McCartney to support Cara Delevingne at one of her final “Cabaret” performances in London.

Trading her bedazzled Eras Tour costumes for something cozier, the Grammy winner pulled her pal in for a hug backstage after the show, as seen in a snap Delevingne shared on Instagram Thursday spotlighting some special moments from her several-month-long run as Sally Bowles.

It is understandable why Swift chose Stella for this specific outing; the vegan company has been a favorite of hers since the two worked together on a collection in 2019 that drew inspiration from Swift’s “Lover” album. (The British designer is also mentioned in “London Boy,” one of the tracks.)

Taylor showed up to support Taylor near the end of a months-long run in Cabaret, which came to a conclusion on Saturday night

In addition to incorporating McCartney’s sustainable styles into many of her street style looks since then, the “Cruel Summer” singer also posed in one of Stella’s plaid coats for the cover of her woodsy “Evermore” album in 2020.

“Stella is so creative,” Swift told fans during a YouTube Q&A ahead of her music video premiere for “Willow,” the album’s lead single.

“I told her I had a sеcrеt project and she designed clothes that were EXACTLY what I imagined. I drove to her office, picked them up and took them into the woods!!”

The Grammy winner has incorporated McCartney’s sustainable styles into many of her street style looks.

McCartney also dressed Swift for her “Evermore” album cover.

Clearly, the appreciation is mutual; “Knowing someone well makes creating something for them easier. With Taylor, everything happened so naturally; the pieces I made reflected the effortless emotionality of her album,” McCartney wrote on Instagram at the time.

“Complementing a friend’s creation is rare and precious and feels incredibly special.”

Delevingne’s long been close with McCartney as well, having walked in her runway shows, attended multiple Met Galas in her designs and, most recently, starred as the face of her brand’s summer 2024 campaign.