Interview tomorrow!

ebd08

I have an interview tomorrow!!  On a whim I decided to apply for a secretarial job at a school here, because I like the idea of being on a school's schedule (summers off, fall, spring & winter breaks).  The principal is really laid back and actually said I could bring Eli with me to the interview!  (I didn't ask - she just straight up offered.)My question is - if the interview is going to be pretty casual, would you still wear a suit?   My other option is a brown collared dress with tiny polka dots on it.  Do you think that is okay to wear?