I want to get into the Fashion Institute of Technology, but do I need...?

a portfolio if I want to be a Fashion Merchandising Management major?

I never worked on anything for a portfolio before? What would I do?

All your questions are answered on their website:

http://www.fitnyc.edu/aspx/Content.aspx?menu=FutureGlobal:FAQs:AdmissionsFAQ

LOL, I thought that was a joke name for a college. Can't believe it.