Lilly Pulitzer is a brand of clothing that is popular in the South. Here's a link:
http://www.lillypulitzer.com/summer2...gallery_1.html
The dresses tend to be somewhat on the pricey side, but are very summery and usually look great for rush. You can buy them in the "Better Sportswear" department of many department stores. The website also has a store locator that might help if no department stores near you carry that brand.
I think it's more of a style than anything else... if you don't have a store that carries these particular dresses, you're sure to find something similar. The idea is to be summery and cute, yet conservative and put together.