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