How this myth got started isn’t exactly known. One possible contributing factor to this myth was Marilyn Monroe’s a typical extreme hour glass shape. More directly, it probably partially stems from the fact that women’s sizes today are not at all equivalent to women’s sizes in the 1950s. In the 1980s, in order to accommodate people’s vanity and ever expanding girth, the U.S. Department of Commerce got rid of the uniform sizing system and instead allowed for more ego stroking sizes. As a result of this, today, a size 8 would have been roughly equivalent to a size 16-18 in the 1950s, obviously though this varies a shocking amount from brand to brand.