Emma Watson went for black and white colorblocking in a Jacquemus design for Monday’s business forum for The Royal Foundation’s United for Wildlife event in London.

The “Harry Potter” alum joined Prince William of the U.K. and Oscar-nominated actor Benedict Cumberbatch for Monday’s event, at which she sported La Robe Pisello look from the French luxury fashion house that appeared loosely inspired by the spring 2026 ready-to-wear collection.

Watson’s black and white dress featured a fitted black bodice with a scoop neckline that framed her antique pearl and heart pendant necklace. The bodice included short sleeves and fell just below the waistline.

At the drop waist, the piece transitioned from fitted black fabric to a flouncy white material with a tiered element. The white cotton poplin skirt included a frilly top tier, followed by an intricate floral design with cutouts and then a final tier that created a midi hemline.

La Robe Pisello featured a striking resemblance to a dress featured as part of the French luxury brand’s spring 2026 ready-to-wear collection, which made its debut in June 2025 during Paris Fashion Week.

Watson’s dress resembled look number nine from the collection, which was curated by the brand’s founder Simon Porte Jacquemus. The curation was inspired by “hardworking folks in the fields, or selling their crops on roadsides,” Miles Socha wrote in WWD’s review of the collection.

The designer’s “fields-to-catwalk narrative came to life in a surfeit of sack dresses and smock tops, some too oversize, and generous, full-circle skirts worn like aprons, the fabric piled up in dense folds at the front,” Socha wrote.

London’s 2026 Climate Action Week kicked off on Saturday and continues through June 28. The independent climate event features a slew of forums and conversations with high-profile figures championing conservation and environmental mindfulness for the future health and well-being of the planet.