Kate Middleton wore a $91 rented neon-green gown and an emerald choker once worn by Princess Diana to the Earthshot Prize awards

• The 2022 Earthshot Prize awards took place in Boston, Massachusetts, on Friday night.
• Kate Middleton, wearing a neon-green rented dress, joined Prince William on the red carpet.

Kate Middleton channeled the environmental initiative of the Earthshot Prize by wearing a rented dress to the awards ceremony in Boston, Massachusetts, on Friday.

The royal, who has developed a reputation for repeating her best looks now and again, joined her husband Prince William on the red carpet at MGM Music Hall for the second-annual event.

William launched the global-environmental initiative in 2020, citing President John F. Kennedy's 1962 "Moonshot" speech, which encouraged Americans to support moon exploration, as inspiration.

The couple was all smiles on the red carpet and photographs from the event show them interacting with their star-studded list of guests, including the actor Rami Malek and the professional soccer player David Beckham.

In keeping with the ethos of the Earthshot Prize, Kate wore a neon-green off-the-shoulder dress from the brand Solace London, which is available to rent on Hurr for between £71 and £194, or between about $91 and $238.

The something-borrowed mentality of the Princess of Wales didn't end there. Kate, 40, accessorized the look with a silver-and-emerald choker necklace Princess Diana wore in 1993.

According to The Court Jeweller, Friday marked the first time Kate had worn the piece of jewelry, known as Queen Mary's Emerald Choker, which dates back to 1911.

Diana wore the piece multiple times before her death in 1997 and even experimented with how to style it. During a royal visit to Australia with then-Prince Charles, she was pictured wearing it as a headband.

William, 40, also went the vintage route at the Earthshot awards. The heir to the British throne wore a blue-velvet suit that People Magazine reported he's worn multiple times to royal events.

Both William and Kate handed out the prizes during the ceremony on Friday, which included offering $1.2 million in prize money to the winners of five separate categories: nature protection, clean air, ocean revival, waste elimination, and climate change.

According to USA Today, the prince spoke with optimism about solving the world's environmental issues as a collective: "In the same way the space effort six decades ago created jobs, boosted economies, and provided hope, so too can the solutions borne of tonight's Earthshot Prize winners."