As if figuring out what to wear on the average day weren’t hard enough. Now you’ve got to decipher what looks “casual chic” (?!?) for a big event. “Hosts are getting so creative with dress codes that guests are left scratching their heads,” says Derek Guillemette, the director of ready-to-wear for Rent the Runway, a company that rents designer evening wear. “Our personal stylists are bombarded with questions from customers about which styles will fit well and fit within a certain dress code.” And it’s not only women; men are stumped, too. To the rescue: a handy invitationese-to-English dictionary. So you and your other half can rise to any occasion.