Three-dimensional (3D) scanning is increasingly used in the apparel industry to provide accurate measurements of body size and shape as manufacturers strive to improve garment fit and design. Scanning the torso and breasts of women, for example, has substantial potential to improve bra design and fit by providing an accurate 3D computer mesh of an individual’s torso and breast shape. Important design and fit parameters can be calculated from this computer mesh to aid in designing bra cups that are of correct size and shape to encase the entire breast, as well as bra bands and straps that fit the torso. Accurately measuring breasts, however, depends on scanners being able to visualize an entire breast. Although 3D scanning has been validated to accurately measure breast volume, it has limitations when measuring large and ptotic breasts, where the lower aspect of the breast sits on the anterior abdominal wall, making it difficult for the scanner to visualize and therefore measure this part of the breast. This chapter describes the effects of different scanning methods and postures on the accuracy of measurements derived from 3D scans of the torso and breasts of women of varying breast sizes. This information can assist to minimize errors associated with breast measurements to ensure that 3D scanned data can be used effectively to improve the design and sizing of bras.