Kate wore the Camden Cashmere Jacket from Ralph Lauren Collection - a beautifully tailored, double-breasted blazer - in the dark racing green colourway. Her two sons, Prince George and Prince Louis, echoed her refined style, choosing Ralph Lauren linen shirts - a wardrobe staple that works equally well for smart and casual occasions. It is also a styling formula that has become synonymous with Kate's wardrobe. The Princess frequently uses tailored jackets to add polish and structure to dresses, skirts and even denim. For those looking to recreate Kate's sophisticated smart-casual aesthetic, explore my edit of exact product matches and high street alternatives below.