Christian Dior chats with two of his models at the Savoy Hotel , London left Sylvie wearing Mozart , and elegant evening gown in champagne tulle , embroidered in diamonds and straw and right , Tania wearing Debussy , and evening dress in dark blue tulle embroidered in sequins in blue . This is the first time Dior has shown his creations in London and a party of models were flown over especially for the show . 25 April 1950