To fill in your own size, first open the Taobao APP and click on the settings in the upper right corner of the My page.

After clicking on the settings, select My Profile.

Then click on the column of adding body information in My Account and click in to add it.

After clicking, it will have information such as shoulder width, chest circumference, upper circumference, lower circumference, waist circumference, hip circumference, etc. Just click and enter according to your own size.