What does a white wedding dress symbolize?

The practice likely traces back more than 2,000 years, with roots in the Roman Republic (509 B.C. - 27 B.C.) when brides wore a white tunic. The color white represented purity, symbolizing both a woman’s chastity and her transition to a married Roman matron. It was also associated with Vesta, the virgin goddess of hearth, home, and family who was served by temple priestesses garbed in distinctive white clothing.

Source: Ohio State News