During a visit to the maternity ward at Su County Hospital, she wore a striking yellow Karen Millen dress. The visit was to explore the hospital's support for pregnant women and new mothers, a cause close to her heart since becoming a mother.

The bright yellow dress, dubbed the 'forever dress', featured a knee-length skirt with pressed pleats, a unique plunging neckline and above-the-elbow sleeves with shoulder detailing. It also included a matching belt. Catherine paired the stunning dress with navy suede heels and a navy clutch.

A mother of three, Catherine looked radiant as she held a newborn at the Royal Surrey County Hospital during her visit. While her appearance in October 2022 attracted significant attention, it wasn't the first time she had worn Karen Millen; she has worn various pieces from the brand at public events.

In April 2023, Catherine showed off her chic style during a trip to Birmingham, marking the couple's first public appearance since their Easter break together. At Indian Street, a family-owned restaurant, she wore a burgundy pleated dress that paid tribute to the city's rich culture.The dress featured a deep lapel, a belted waist and a neat pleated skirt. According to Karen Millen's website, the dress has been ideal for colder days for over a decade. This was the second time she has worn Karen Millen for an engagement.

Catherine paired her burgundy outfit with pieces that had previously appeared on the scene. Known for their timeless, structured designs, Karen Millen perfectly suited Catherine’s taste for formal yet feminine clothing. The brand offers dresses that combine elegance and ease of wear, which is a natural fit for the Duchess.

Whenever Catherine wears a Karen Millen item, it often sells out quickly – a phenomenon known as the “Katherine effect”. This highlights her impact on the fashion industry, inspiring women around the world to adopt her classic and practical style through accessible brands.

By choosing simple yet elegant styles from Karen Millen, Catherine has increased her popularity among the public. Her choices have cemented her status as a fashion icon, effortlessly combining royal sophistication with everyday wearability and promoting British fashion globally.