In the “Subject” box please, title your portfolio with:
Your Name, Major and if applicable your Concentration (Fashion - Design).
About the word "concentration," I checked the dictionary, and found a definition which goes:
concentration definition | Dictionary.comthe focusing of a student's academic program on advanced study in a specific subject or field.
So, the concentration is the intended purpose of the course I took?
or the focus of the content of the portfolio?
No - it means what will be the area that you will concentrate on within your chosen field.
for example, your field may be Elementary Education, with your concentration: Reading Instruction
field: Fashion Design
concentration: theater costuming