Clothes for an interview...?

If you have an interview at a clothing store, do you want the more professional look or do you want a look that says, "I have style, the kind your store has".. I don't own a thing from this store but I'm so worried about what to wear. I hear "jeans" or "skirts" but I have no idea.. shirts are easy enough and jewelry but no idea what to wear on the bottom! i have this skirt - http://www.target.com/gp/detail.html/ref=br_1_9/602-5906622-0126207?ie=UTF8&frombrowse=1&asin=B000RFLRIM but i dont know if thats nice enough? and can these jeans p for an interview, if paired with a nic shirt and heels/wedges? http://www.ae.com/web/browse/product.jsp?catId=cat90120&productId=1435_7940