A memorable moment that demonstrated her love for accessible style came in October 2022 when she wore a Karen Millen dress. During a visit to Surrey County Hospital, Catherine wore a striking yellow Karen Millen dress. The visit was to raise awareness about support, an area she has focused on since becoming a mother. The dress, called the Forever Dress, features a knee-length skirt with pressed pleats.

The dress featured a distinctive scoop neckline and elbow-length sleeves with raised shoulders. The dress also came with a matching belt, which she chose to wear. To accentuate the bright yellow dress, Catherine paired it with navy suede heels and a navy clutch. The 40-year-old mother of three looked radiant as she held a newborn at the Royal Surrey County Hospital, where she was learning about maternity services.

While her appearance in October attracted significant attention, it wasn't the first time she had worn Karen Millen. She has been spotted wearing a range of the brand's dresses for public engagements that require a polished yet approachable look. In April 2023, Catherine showed off her chic style during a visit to Birmingham, marking her first outing since her family's Easter break.

On this occasion, she wore a burgundy pleated dress to celebrate the city's cultural diversity. The outfit featured a scooped-off lapel, a belted waist and a neat pleated skirt, which the Karen Millen website notes is suitable for colder weather. It was the second time she had worn Karen Millen to an engagement in the past twelve years. Catherine paired her burgundy dress with familiar accessories. Karen Millen is known for her timeless, well-tailored designs with structured silhouettes, bold colors, and quality fabrics.

This fits Catherine’s taste for elegant, feminine pieces. The brand offers dresses that combine elegance with accessibility, making them the perfect choice for the princess. Whenever Catherine wears a budget brand like Karen Millen, the pieces tend to sell out quickly. This phenomenon, known as the “Catherine effect,” highlights her influence in the fashion industry, inspiring women around the world to adopt her timeless, practical style.