is a sweater dress okay for a casual interview?

I have an interview at the local grocery store, they said to dress business casual. I'm not sure what to wear because everything I own seems too formal or too slouchy. My friend suggested I wear my sweater dress, and pair it with black tights and knee high boots. She wears similar outfits as a restaurant host, but I'm not sure it's appropriate for an interview. The interview is pretty casual from what I've heard, but I don't want to come off as lazy, even though I've been told people have gone in wearing nice jeans and a t-shirt. So would the sweater dress be okay?