In the UK, a size 12 typically refers to women's clothing measurements. It generally corresponds to a bust measurement of 36 inches, a waist measurement of 28 inches, and hip measurements of 38 inches. This size is often considered a medium in many clothing brands. Size 12 can vary slightly between different brands and styles, so it's important for shoppers to check specific sizing charts. Additionally, UK size 12 is often compared to US size 8 and European size 40, highlighting the differences in sizing systems across regions.