Well, first things first, I don't think you should take the job because you're supposed to be moving up here!

Now, back to your question, I would think smart casual for both of you. Does dh even have a nice buttoned shirt and a pair of black or navy pants. I suppose they wouldn't need to be long pants either, maybe some nice 3/4 pants? I know dh has some nice dressy ones he got from Myer which he wore for an interview (and he got the job).