There's some research on the hourglass figure:
http://en.wikipedia.org/wiki/Female_body_shape
"... A study of over 6,000 women carried out by researchers at the North Carolina State University around 2005 found that 46% were banana (rectangular), just over 20% pear, just under 14% apple, and 8% hourglass.[1]
Another study has found "that the average woman's waistline had
expanded by six inches since the 1950s" and that today women are taller
and have bigger busts and hips than those of the 1950s.[1]"