Here is the size chart for selecting Speedo swimsuits for women. For these swimsuits, your bust, waist, and hip measurements are used as a basis to find your correct size.
If you happen to fall between two sizes, the most important measurements are usually the hip and bust measurements. Additionally, consider the desired fit. For a tight fit, choose the smaller of the two sizes; conversely, opt for the larger of the two sizes if you prefer a looser fit.