Susannah F Constantine (born 3 June 1962) is an English fashion journalist, advisor, television presenter, author and designer. Her second book, co-written with her fashion partner Trinny Woodall, What Not to Wear, has won her a British Book Award and sold 670,000 copies.
Constantine was born into a wealthy family; her father was successful in property and shipping sectors. She was privately educated as a child and went on to date British royalty, David, Viscount Linley, during the 1980s. Constantine has been involved in fashion for a long period, originally working in America for Giorgio Armani and then John Galliano in London. She met Trinny Woodall in 1994, with whom she both proceeded to write a weekly fashion column, Ready to Wear. They founded Ready2shop.com, a dot-com fashion advice business, and wrote their first fashion advice book in 2000, Ready 2 Dress, both of which failed. From there they were commissioned to BBC Two to host the style series, What Not to Wear, from 2001 to 2005. She made regular appearances as a style advisor on The Oprah Winfrey Show and following her success on the shows, she went on to co-host Trinny & Susannah Undress... on ITV in 2006 and Undress the Nation in 2007. Constantine and Woodall have now dressed over 5,000 women.