The 3D Fit Finder tool on the Gap and OldNavy website and apps revolutionizes online shopping by providing an innovative way to find the perfect size and fit for clothing items. Using physics based gen AI simulation, this tool enables users to create a personalized avatar based on their body measurements and preferences. Customers can choose from a range of styles from GAP and OldNavy and model them on their 3d replica to check the fit of the clothing. This could potentially save substantial time, as well as lower the number of returns.