I've graduated from doing a degree in Fashion Design a few months ago so there's probably people here who can give better advice than myself, but I will tell you my opinion nevertheless!
I went to the University of Westminster in London and a lot of my tutors always said that Fashion Design was a great degree to have as it covers so many areas in the fashion industry. .. during my time there, I did lengthy essays where I could choose to do it in article style or as a thesis, I did fashion manufacturing modules, buying and merchandising.. I tested it all out.. and one of my tutors was a buyer for Topshop and actually said that people in the industry prefer choosing Fashion Design Graduates for a Buying job, as opposed to Fashion Buying graduates.. only because Fashion Design graduates typically know more about fashion and how it clothing is made etc.. .. This was confrmed during my manufacturing lessons where the Buying students hardly knew anything about fabrics.
..Oh I could talk about this for ages! .. My point is, with fashion design, I was able to dabble in all areas to find out what I liked the most... then I would do internships to gain further experience.
For example, we had to go away for a month and gain some hardcore fashion industry experience. I went to Moschino and there was a girl there who did Fashion Design at my university and was now doing PR and she was really great at it, I learnt a lot from her.. I thought that was what I wanted to do!... but I felt that I wouldn't be able to be as creative as I'd like to be, so I went for a design internship and it all became crystal clear, that was what I had to do!
It's hard deciding though, as different places offer different things.. .. hmm.. lets see what other people say..