When asked what the “secret behind her wardrobe of adorable sundresses” was, Deborah Ann Woll (aka Jessica) said Walmart! You can find one of the dresses (pictured below) here.

Apparently the stylist on the show knows that in order for it to be realistic (set in Louisiana), the characters cannot wear designer clothes. So instead she buys stuff from Walmart and has them tailored to fit each character perfectly.