A women's size 8 is typically 27.5 to 28 inches at the waist, according to About.com. One factor to consider is that most manufacturers have their own size charts, so the waistline may vary slightly between manufacturers.
Some companies offer size 8 jeans that have a waistline of 25.5 inches and 36 inches for the hips. A size 8 dress, on the other hand, has different measurements to consider. When purchasing a dress, it is best to know the size of the bust, waist and hip area of the outfit. These measurements make it easier for a person to buy the right size for her body type.