As of 2014, the general measurements for a women's size 6 are 34.5 to 35 inches around the bust, 26.5 to 27 inches around the waist and 36.5 to 37 inches around the hips. However, these measurements typically vary by manufacturer and change over time.
Women's sizes vary because there is no standardization. This means that clothing typically labeled as a size 6 is often listed as a different size under another manufacturer's label. Sizes also vary greatly for vintage clothing because the average size and shape of the female form has changed. For instance, an average woman in 1941 measured 5 feet 2 inches and weighed 129 pounds. As of 2014, the average woman is 5 feet 4 inches and weighs 144 pounds.