Jacques Fath , Paris fashion designer held a parade of his summer fashions at his salon . The new trend includes mono-coloured dresses , tight skirts and scored on pleats . Linen and chiffon are the most popular materials . Photo shows: One of the the Jacques Fath summer fashions , " No 183 " , a black alpaca dress , drawn in tightly at the knees and topped by a white linen coat , splitting at the back and held by two buttons at the neck . 20 April 1950