I first talked about wearing sweaters over dresses back in the fall, but it works perfectly for spring weather as well. For proof, look how cute this combination is on Miss Sarah Jessica Parker.
I'm beyond tired of cardigans, and this provides a fresh look for dresses on colder spring days. It works best if the sweater has a loose knit or a cropped fit to keep the feeling light. You can also extend your wardrobe by pairing sweaters with your fancier frocks that seem too precious for everyday wear.