The one thing you probably don’t want to wear a lot of for a daytime wedding is black. Cocktail-type dresses just aren’t daywear, and more importantly, wearing black in the sun will just make you hot! White may also be a no-no. Remember that if the ceremony is at a religious site, you don’t want to show too much skin, either (i.e., shoulders should be covered). For men, daytime weddings in the spring or summer call for light-colored suits. Options include linen or seersucker. In cooler months, wool suits and darker colors like navy blue and charcoal gray are the way to go.
Depending on how formal the wedding is (you can usually tell this from the formality of the invitation and/or where the wedding is being held), the dress code is cocktail dresses for women and darker suits (or tuxedos, if it’s a black-tie affair), for men. Or, women can wear a dressy suit or nice dress.