Have you checked out OPI or ESSIE this year? They are coming up with some great colors that will last!
You have you neutrals, spicy deep reds, deep oranges(Go Clemson) light pink and one can never go wrong with a gray.
The Zafira Dress by Trina Turk is a perfect wedding pick! With the lace overlay and belted waist, it presents a perfect and "safe" fit for a casual or more dressy wedding! (not to mention the color being navy, which is this summer's "new black")
clutch (or coral if you can find it) and your safe for any casual wedding thrown your way!