Sofia Richie Grainge Just Wore a Black-Tie Wedding Guest Dress

published 6 June 2025

Nicknamed "the billionaire's playground," Monaco is one of the richest countries in the world when measured by GDP per capita. Smaller than NYC's Central Park, the region is jam-packed with yachts, Michelin-starred restaurants, and luxury hotels. Residents of this tax haven love wearing the newest designer pieces, but Sofia Richie Grainge decided to take a different approach.

During a trip to Monaco, Richie Grainge wore an archival gown from Yves Saint Laurent's S/S 79 collection. Yep, that means her 46-year-old dress is nearly double her age. On the runway, the gown was styled with a red coat, but Richie Grainge was wise to ditch the outerwear for her seaside summer night. Scroll down to see her new Instagram post, which has amassed over 100,000 likes in a matter of hours, and shop similar dresses for your next black-tie wedding.

Sofia Richie Grainge wears a vintage gown in Monaco.

On Sofia Richie Grainge: Saint Laurent S/S 79 dress and Minaudière ($3700)

A runway model wears a black and red YSL dress.

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Erin got her start as a Who What Wear intern in 2011—back when the site only published a single story per day. (We have since increased that number twentyfold.) She graduated magna cum laude from USC and lives in Los Angeles. In college, she also interned at Refinery29, where she was promoted to editorial assistant and then assistant editor. After nearly three years at R29, she came back to WWW in 2015, where she is now the Associate Director of Fashion News. From the Oscars to the Met Gala, she leads the site's entire red carpet coverage strategy. She specializes in celebrity and fashion news but also enjoys writing travel features and runway reports. She frequently contributes to WWW's social accounts and has a sizable following on her personal TikTok.