Waist–hip ratio
WHR is used as a measurement of obesity, which in turn is a possible indicator of other more serious health conditions. The WHO states that abdominal obesity is defined as a waist-hip ratio above 0.90 for males and above 0.85 for females, or a body mass index (BMI) above 30.0. The National Institute of Diabetes, Digestive and Kidney Diseases (NIDDK) states that women with waist-hip ratios of more than 0.8, and men with more than 1.0, are at increased health risk because of their fat distribution.
U.S. standard clothing size
As this was largely successful in men, the same approach was attempted in the early 20th century for women using the bust as the sole measurement . However, this proved unsuccessful because women's bodies have far more variety in shape. The hourglass figure is frequently used as an industry standard, but only 8% of women have this body shape . A woman with an hourglass figure and a woman with an apple-shaped figure who have the same bust size will not have the same waist or hip sizes.