You are generally describing the inverted triangle type of body shape. This is a sub-type of the hourglass. Only about 10 percent of women fit this body type. I don't necessarily agree that they have to be blonde (or even caucasian) but if the shoulders are generally in proportion to wide hips (and a small waist) then the woman is generally considered to be very fertile in most cultures.
http://en.wikipedia.org/wiki/Female_body_shape
Lu Varley is a good example by the way.