Banks rewore a red Bagdley Mischka gown she first wore to the Vanity Fair party in 2004, she explained on Instagram.

\"It’s gorgeous and it fits … so why not wear it again?!,\" she wrote, adding that she hoped to \"bring global awareness to the importance of sustainability in fashion and consumerism as it relates to climate change, production & consumption, ocean pollution, labor & women.\"

View this post on Instagram

A post shared by Elizabeth Banks (@elizabethbanks) on Feb 9, 2020 at 5:47pm PST

Thrive founder Arianna Huffington also wore a repeat look to the Vanity Fair party. She tweeted that her black dress was the same one she wore to the party seven years ago.

As you probably know, I am a big fan of #repeats. When you own something you love, wear it again and again. It saves time, money, mindshare and the environment! This year at the #VFOscarParty I re-wore the same dress that I wore at the VF party 7 years ago. pic.twitter.com/sK0tWHDE4o

— Arianna Huffington (@ariannahuff) February 10, 2020

The last major awards ceremony before this year's Oscars, the British Academy of Film and Television Arts (BAFTAs), asked attendees ahead of time to make \"sustainable fashion choices\" and avoid wearing new outfits for the occasion.

Among the attendees who heeded that call to action was Duchess Kate, who attended the ceremony with Prince William.

View this post on Instagram

A post shared by Kensington Palace (@kensingtonroyal) on Feb 2, 2020 at 4:56pm PST

Kate wore a slightly re-fashioned gown by British label Alexander McQueen that she previously wore in 2012 during the Cambridges' tour around Southeast Asia and the South Pacific in honor of the queen's Diamond Jubilee.

A 2019 Resale Report released by ThredUp, a digital consignment company, claims that everyone buying one used item instead of new this year would save 5.7 billion pounds of carbon dioxide emissions.

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