Thank you, everyone!
Tupelo suggested boots, which was my first thought as well. But, I don't feel like I have anything suitable. However, I'm going to try it with what I have and see how it looks.
Also, some of you suggested wearing a shirt under the dress (sort of a jumper look?). I'll give that a try as well. I have plenty of room to wear a fitted T under.
Btw - Dress $25 from Target. Cardigan $8 VanHeusen outlet. Shoes $15 Naturalizer outlet. Belt I had laying around.