My 11-year-old and I will be in Chicago for several days in mid-March. We have not made a hotel reservation yet, but we probably will be staying in the downtown area. We are adventurous eaters, and we enjoy all kinds of ethnic food. We would like to sample quintessential Chicago cuisine (and avoid chains, unless they are local/regional chains). Here is the hitch: We will be traveling light and our attire will be limited to jeans/khakis, and not even fancy jeans/khakis at that). Thus, we will need to eat at places that have a very low-key/relaxed dress code. Thank you for any help you can provide with recommendations for lunches and dinners at casual restaurants.