Jumpsuits were a stretchy adaptation of overalls. Using the restroom in them was precarious. During the day the jumpsuit was made of double knit polyester, cotton or denim with a zip or button up front, pant pockets and oversize collar. The denim jumpsuit with a zip up front revived the overall look. Evening jumpsuits slimmed down the look into a stretchy bodysuit with a sleeveless or halterneck top. Shop 70s jumpsuits.