In doing some research I have found that the female hourglass measurements vary greatly due to the height of the individual person but I found this Wikipedia article to be a very straight forward evaluation.
Female body shape or figure is the cumulative product of a woman’s skeletal structure (her build) and the quantity and distribution of muscle and fat on the body. There are, and have been, wide differences on what should be considered an ideal or preferred body shape, both for attractiveness and for health reasons. These have varied among cultures simultaneously. As with most physical traits, there is a wide range of normality of female body shapes.
Human beings and their cultures have perennially focused attention on the female body as a source of aesthetic pleasure, sexual attraction, fertility, and reproduction.
The female body occurs in a range of shapes. The female figure is typically narrower at the waist than at the bust and hips, and usually has one of four basic shapes: banana, pear, apple, or hourglass. The bust, waist, and hips are called inflection points, and the ratios of their circumferences define these basic shapes. Usually, the bust area will depend on the person’s weight and height.
In conclusion, for women attempting to achieve the ideal female physique I have found a really good detailed video that goes into exactly how one can achieve the hourglass measurements. Check it out below…