 They were commissioned by the BBC to host What Not to Wear in 2001 . The following year Woodall and Constantine released their second book , What Not to Wear , which gained them a British Book Award and sold over 670 @,@ 000 copies . The pair co @-@ wrote 11 fashion advice books , several of which became best @-@ sellers in the United Kingdom and the United States , and have now sold over 3 million copies worldwide . In 2003 they launched their shapewear range Trinny & Susannah 's Original Magic Knickers , which are sold in 30 countries around the world . 
