I know it's pushing it (I can hear my Brazilian girlfriends say that no one should pay that much for a pair of Havaianas sandals), but I really like these Havaianas Top Crystal Thongs. One of my girlfriends got a pair in indigo in Saint-Tropez and they look so cute! It's like being casual, but the three Swarovski crystals on the sandals' strap give them a slight touch of fanciness.
And if you plan to get married on the beach the Sarah Michelle Gellar way, get these Havaianas sandals in white. You'll sparkle all over!