Clothing store please read?

I am about to get an interview with a high end clothing store. I just moved and needed a job so I applied. Thing is, as dumb as it sounds, I don't really know anything about fashion <my idea of "style" is a tank top and shorts/pants>. Ok so my question is: so I don't sound as dumb as I'm sounding now in the interview <or while working, provided I get the job> can someone give me a quick crash course.

Thanks to all in advance :)