The New York Film Festival opened more than two weeks ago with Ava Duvernay's documentary 13th, which charts the history of racial inequality in the criminal justice system and mass incarceration. And on the festival's closing night Saturday, it rounded out a slate that also included Moonlight, Manchester By the Sea, and Billy Lynn's Long Halftime Walk with the Sienna Miller- and Robert Pattinson-starring vehicle The Lost City of Z, based on David Grann's 2009 book of the same title. It tells the true story of the British explorer Percy Fawcett, who was sent to map the Brazilian-Bolivian border for the British government at the outset of the 20th century. Sons of Anarchy actor Charlie Hunnam plays Fawcett, while Sienna Miller plays his wife Nina. And for the film's New York Film Festival premiere, Miller skipped the traditional red carpet gown and opted instead for a quirky, runway-fresh Prada ensemble, complete with feathers for added effect.

Sienna Miller in Prada at the New York Film Festival closing night gala in New York, New York, October 2016.

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Who: Sienna Miller.

When: Saturday, October 15.

Where: The closing night gala of the New York Film Festival, where Miller premiered her new film with Robert Pattinson and Tom Holland, The Lost City of Z.

What: A black and red chiffon pajama ensemble by Prada with feathered cuffs, a contrasting belt, and red platform sandals.

Why: Marabou feathers trimmed many of the looks on Miuccia Prada's Spring 2017 runway, from skirts to accessories to the cuffs of pajama tops and trousers. For the premiere of her new film, The Lost City of Z, Miller selected a Chinese-inspired top with frog buttons — a look that came complete with some of the boldest feathers of the latest Prada collection. The contrasting seafoam green and coordinating black cuffs elevate a relaxed, pajama silhouette — because, after all, it's been a long two weeks of film premieres. A hint of loungewear is certainly in order.