How to Add Fashion Extras?

First check this on how to add extras in general 

There isn't any difference in how to add extras for a fashion store than any other store in the steps. But it differs with the types of extras to add.

You can add the size and color in different options as follows:

Extra (1):

• from the"Customer Choice Options" tab in a product interface add a new customer choice write the "Option Title" for instance in Arabic (المقاس) and in English (Size) then set the following criteria for the "Option Type"  (Single / Multiple Choice)  for the "Required" Option (Yes/No)
  
• Add the Extras you want after clicking on "Add New" button that is right above the "Option Values" to the right
• then write the extra name in Arabic "صغير" and in English  "S", and its price 
• keep adding all the options of the sizes in the same way
• then click on "Save"
  

Extra (2):

• from the same tab "Customer Choice Options" click on "Add Customer Input Options" button
  
• write the "Option Title" for instance in Arabic (اللون) and English (Color) then set the following criteria for the "Option Type"  (Single / Multiple Choice)  for the "Required" Option (Yes/No)
• then write the extra name in Arabic "أسود" and English  "Black", and its price 
• keep adding all the options of the colors in the same way
• then click on "Save"

Note: Please click here it will guide you on how to set stock for your product extras.