Even the acid-tongued Dowager Countess would find little fault with Elizabeth McGovern’s Cannes attire. The actress, who plays Lady Cora Crawley on Downton Abbey, feted the remastered version of Once Upon a Time in America in an ivory certified-organic silk gown by Gucci, which funded the 1984 film’s restoration with Martin Scorsese’s Film Foundation. A two-time veteran of Livia Firth’s Green Carpet Challenge—she’s worn outfits by Henrietta Ludgate to both the Royal Television Awards in 2011 and a Golden Globes party earlier this year—McGovern was squired by none other than Firth herself, who played counterpoint in a Gothic black version with an open back and neck ruffle.

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“The whole event brings together things I love,” Firth wrote in her blog. “Italy, a movie I grew up with—Ennio Morricone’s theme is a habitual ipod favorite!—and my friend Elizabeth McGovern, who starred in the movie when she was just 23. For this challenge, we got to work with Gucci, too.”

The duo completed their ensembles with jewelry from British ethical goldsmith Anna Loucah.

The duo completed their ensembles with jewelry from British goldsmith Anna Loucah, who crafts her wares locally with pink tourmaline, traceable Canadian diamonds, and recycled white gold. Firth also included earrings from Calleija, an Australian jeweler that uses only traceable domestic diamonds. “It’s always a lot more fun to have a friend with you,” she added. “[McGovern] also helped to settle my nerves as [the] Cannes red carpet is pretty intimidating.”