Riley Keough wore a sheer Chanel Haute Couture look on the Cannes Film Festival red carpet Thursday evening. Getty Images Just call it sheer audacity. Riley Keough came dangerously close to breaking the Cannes Film Festival dress code Thursday night, attending the “Histoires Parallèles (Parallel Tales)” premiere in sheer Chanel Haute Couture. Comprised of a collarless jacket, midi skirt and top — all crafted from nude-hued organza embellished with beads and pearls — the see-through ensemble allowed the actress’ pale blue lingerie to peek through. The actress’ lingerie played peekaboo. Silvain Roger / BACKGRID Last year, the film festival updated its dress code, prohibiting nudity on the red carpet and elsewhere at the event. Silvain Roger / BACKGRID While the silhouette may have been conservative, the fest famously banned body-baring styles in 2025. “Nudity is prohibited on the red carpet, as well as in any other area of the festival,” according to the updated Cannes rules . Also a no-go?…