and nancy giles with the skinny on spandex. thick and thin? nancy giles has a nominee. >> reporter: it's the time of year for christmas trees. kwanza traditions, the symbolic hanukkah men or a, a time to eat, drink and be merry. a time to celebrate one of the most brilliant and forgiving inventions of the 20th century. a time for stretch fabrics. think about it. you're eating, drinking and mer reeating christmas cookies as you make them. that's what i do anyway. unless you have a tremendously fast metabolism, your body is probably expanding. so when it's time to dress up and hit those parties, aren't you grateful that you have the option of putting on something with some give? can you imagine life without stretch? yet there was a time when it wasn't readily available. >> a suit with a built-in girdle. >> reporter: after painstaking years of research in 1959 spandex and lycra were introduced to the market. spandex is an and a gram of the word expand. get it? stretch fabrics first saw lights in swim suit and athletic garments and