Why are wedding gowns White?

Prior to the sixteenth-century, bridal gowns were more akin to everyday garmets in style and color. During this sixteenth century, European nobility dictated that white would symbolize purity for the bride. At the time, pale or white garments cost more than dark colored ones because bleaching cloth was an expensive process, available to only the affluent.Other symbols of purity worn by more common brides included a coronet of flowers on her head, a veil over her face, her hair down, and orange blossoms or daisies.

White as the symbolic color of maidenhood resurfaced in the culture when the virgin Queen Victoria married Albert in a white gown.The trend has changed little since and in Europe and the United States, most brides still wear a shade of white or ivory.

Fun facts:
In Scandinavia, black is a popular choice for the bride's dress.
In Ireland, green is often worn.
In most Asian cultures, the bride wears red, the color of luck, joy and prosperity.

A Hopi bride's white dress is woven by the groom and any men in the community who wish to assist him.
For more fun facts see "A Bride's Book of Lists" by Marsha Hackman.