A Séraphine dress was worn by the Duchess of Cambridge in the first official photo of Prince George. In addition to royalty, this London firm’s designs have garnered a following amongst pregnant celebrities, including Gwen Stefani and Kate Winslet. Founder Cecile Reinaud, 40, has developed a number of innovations, including discreet side openings for breastfeeding and a jersey made from absorbent bamboo. Séraphine has three London shops and also sells through department stores and online in more than 20 countries. Last month, it opened its first overseas store in New York.