"The New Freedom Thing in in Fashion" or How Jeans Got Their Stretch

A model wears buttoned flared trousers with a matching waistcoat-styled top at a preview of the 'Miss Levi' spring collection, Sonesta Tower Hotel, London, 1971. Photo by Mike Lawn/Fox Photos/Getty Images.

This week we learn how "the new freedom thing in fashion" became the industry standard for the production of women's--and more and more men's-- jeans. This is the story of stretchy jeans.