Pretty in Plus Size In 1960, the average American woman weighed 142.2lbs. In 2010, she weighed 166.2lbs. Following the trend, sizes have also upsized in clothing and downsized in the numbers. Marilyn Monroe, commonly quoted as a size 14, was more likely to have been a current size 0-4. She was tiny, with a 22” waist. Although we all know that our generously over-carbed national diet has caused the 26lbs average increase, my clients are