Entitled: "Bobby Hilsson ad for Tricel culottes, 1968." Bobby Hillson is a London-based fashion illustrator, former designer of children's clothing, and founder of the Central Saint Martins MA Fashion course. She is particularly renowned for her 1960s illustration work. Her drawings embodied the decade with faces inspired by sixties model icon Twiggy Lawson, expert application of pattern, and uncomplicated use of line. In the 1960s, culottes became fashionable, and they were known as hostess pajamas. These trousers were a little more slimly cut, so they more strongly resembled pants, and they were often sewn in brightly patterned fabric with matching tops. Usually, culottes were sold in a set with the top, and were made from fabrics like silk or rayon, which were soft, shiny, and flowing. Fashion is a distinctive and often habitual trend in the style in which a person dresses. It is the prevailing styles in behavior and the newest creations of textile designers. Prior to the mid-19th century, most clothing was custom-made. It was handmade for individuals, either as home production or on order from dressmakers and tailors. By the beginning of the 20th century, with the rise of new technologies such as the sewing machine, the development of the factory system of production, and the emergence of department stores, clothing had increasingly come to be mass-produced in standard sizes and sold at fixed prices.