Emma Corrin wore an optical-illusion minidress that looked like a goldfish in a bag to the 'My Policeman' London Film Festival premiere

• Emma Corrin wore an unusual dress to the London Film Festival premiere of "My Policeman" Saturday.
• The dress, designed by JW Anderson, mirrored a large goldfish in a plastic bag.

Emma Corrin stepped onto the red carpet Saturday in one of their most unconventional outfits yet – a dress that looked like a goldfish in a bag.

The actor wore the look to the London Film Festival premiere of the queer romantic drama "My Policeman." Corrin stars in the film alongside Harry Styles and David Dawson.

The one-shoulder dress, which appeared to be made of a plastic-like material, tied in a knot over one of Corrin's shoulders. An image of a large goldfish aligned with Corrin's abdomen. They styled the statement piece with a pair of black mules, dangling earrings, and minimal makeup.

Vogue reports that the minidress was designed by JW Anderson and the earrings were made by Cartier. The goldfish frock first made an appearance in September at Anderson's spring 2023 show, which also featured upside-down sweaters, tropical prints, and a tribute to Queen Elizabeth II.

Corrin shared a photo from the red carpet on Instagram Saturday, quoting a line from "You've Got Mail" in the caption before writing a touching message about "My Policeman."

"WHO BELONGS TO THIS FISH? (10 bucks if you guess the film)," they wrote. "Huge thank you to LFF for having us premiere My Policeman here in London. Loved making this one, so much heart and a good reminder of what we've fought for and what we still have to fight for."

Corrin has spoken openly about their gender identity and how it's intertwined with their career. In 2021, they told The New York Times that playing Princess Diana on the fourth season of "The Crown" helped them realize they're nonbinary.

In another interview with The Sunday Times' Lotte Jeffs published this weekend, Corrin shared that "in many ways Diana was so queer" because she was an "other" within the royal family and embraced "outsiders" throughout her life.

"My Policeman" hits theaters on October 21 and will be available to stream on Amazon Prime on November 4.