Founded in 1999, What Katie Did has established itself as a premier destination for authentic vintage lingerie, catering to both enthusiasts and professionals in the fashion and entertainment industries. Renowned for its commitment to quality, the brand produces its collections using original 1950s machinery in England, ensuring historical accuracy and authenticity in every piece. What Katie Did's offerings include a wide range of lingerie such as bullet bras, knickers, corsets, and shapewear, all inspired by mid-century designs. The brand also features an array of vintage-inspired fashion items, including dresses, loungewear, and accessories.

Additionally, What Katie Did has dressed notable figures in film and television, supplying authentic pieces to productions like The Crown and Bridgerton. Its commitment to sustainability is reflected in its eco-friendly practices, utilizing biodegradable materials in packaging. With a small but dedicated team in Berkshire, UK, What Katie Did prides itself on delivering expertly crafted lingerie that merges vintage charm with modern comfort, making it a trusted choice for those seeking genuine vintage styles.