Sadie Sink wore Hiraeth Collective, a 100 percent vegan line founded by Rooney Mara, to a red carpet event in 2018, showcasing her support for ethical fashion.

Sadie Sink was named a Chanel ambassador in 2023. She has been associated with Chanel since 2017, wearing their designs to various events, including her first-ever Critics Choice Awards, where she wore a look from the French house’s fall 2022 haute couture collection.

Sadie Sink made her runway debut at Undercover's Paris fall 2018 fashion show, walking in three different looks.