Amazon is standardizing apparel sizes to improve the overall customer shopping experience through consistent and accurate data. Amazon has introduced new apparel size standards, which set sizes based on industry standards.
These new attributes will only allow you to select values from a standardized list. Standardized size values will enable customers to view consistent sizes across apparel products, thereby providing an enhanced browse and search experience.
To ensure your apparel sizes display properly on the website across Amazon stores, visit the Apparel size standards help page to include the valid information for each apparel size you submit.