The unbreakable rule: keep the spotlight on the bride and never wear white, cream or pale pastels. Prints with light backgrounds are fine, as long as they don’t read as white from a distance. If the ceremony is in a house of worship, cover your shoulders with a sleeved dress or jacket. If the wedding’s outdoors, skip the heels and wear comfortable flats that won’t sink into the lawn. A fancier evening reception demands a cocktail dress or your standby little black dress. Beachside festivities are casual, time for sundress with a cardigan or short denim jacket for after dark. And don’t forget the sunscreen.