“Proof seems to come in the form of shapely silver screen siren Marilyn Monroe, who everyone remembers wore a Size 12 during her 1950s heydays.
"That would be equivalent to a Size 6 today," attests Meryle Epstein, 42, acting academic director for fashion marketing at the Art Institute of Phoenix.”
So in about 6 decades there has been a six size change. That is one size deflation a decade. So now the average woman is a size 12 which means that in 120 years the average woman will be a size 0.