Sometimes it is just easier (and less stressful) to pick a dress, but there are some rules to bear in mind. Rule number 1 being, nothing above your knee. Sitting on top of your knee is fine but girls mid thigh is just not a good daytime look! Number 2, I would go for a no cleavage approach and would probably wear 3/4 length sleeves too. Really this is just to keep it professional.
When it comes to shoes DO NOT wear open toe shoes. Closed toe are the only ones you should be wearing. Do not be tempted to wear your highest heels. A simple court shoe or ankle boot will generally suffice. If you normally wear flats then wear flats! I like these floral heels though because they do add a bit of personality to your outfit (fashion jobs only!).
I think it is okay to wear a fitted denim or check shirt to an interview, if you have a beautiful peachy well fitting blazer to go over 'em. Pair em up with black skinny trousers or some skinny cargo trousers and you have a cute, professional on-trend interview look!