Hi
karlim and welcome to CF
This is an interesting thread as something that is not thought about to much. Wearing a white gown by tradition is a sign of the woman's purity of being a virgin before she married, but of course today many women are not virgins when they get married, but tradition always leads to wearing a white dress no matter how many times a woman gets married.
I read an article that said the white wedding gown first originated with Anne of Brittany on the occasion of her marriage to Louis XII of France in 1449, but it wasn't until 1840 when Queen Victoria married Prince Albert that the white dress became popular.
Here are some scriptures I would like to share about the Bridal garment as being a part of the purity and dressed in the righteousness of God as we are the Bride of Christ, but I don't think scripture says anything about wearing an actual white wedding gown.
Isaiah 61:10 I will greatly rejoice in the LORD, my soul shall be joyful in my God; for he hath clothed me with the garments of salvation, he hath covered me with the robe of righteousness, as a bridegroom decketh himself with ornaments, and as a bride adorneth herself with her jewels.
Rev 19:6 And I heard as it were the voice of a great multitude, and as the voice of many waters, and as the voice of mighty thunderings, saying, Alleluia: for the Lord God omnipotent reigneth.
Rev 19:7 Let us be glad and rejoice, and give honour to him: for the marriage of the Lamb is come, and his wife hath made herself ready.
Rev 19:8 And to her was granted that she should be arrayed in fine linen, clean and white: for the fine linen is the righteousness of saints.