This post is in partnership with Fortune, which offers the latest business and finance news. Read the article below originally published at Fortune.com. By Robert Hackett From workaday outerwear to the laps of multi-billionaires, blue jeans have withstood the wear and tear of time as an American icon. Originally called overalls (even without the straps), the pants evolved from a practical solution to protect the laboring limbs of workers to a style suiting just about every demographic.