Let's be frank. How many Wedding dresses have we seen that we thought did not address the importance of a marriage? I think we can say that we've seen pretty dang few.
People getting married in houses of worship will abide by any rules that group thinks proper. People getting married at City Hall or on Uncle Buford's ranch can choose any sort of dress that seems right. THe dress just shouldn't scare the horses on the ranch.
When I was a child,Wedding gowns were to be absolute, pristine white and arms had to be covered from the shoulders to the wrists. In our little town, There was a flap over a woman who was married in the Catholic church. She decided that pure white didn't suit her and had her dress made in a slightly warmer tone. The 'Egg-Shell Bride' was the subject of speculation about her morals for weeks after the Wedding.
Finally, the Pastor of our church decided that a sermon was in order. His theme was that the color of a woman's dress has nothing to do with her character. If a woman chose to be married in red (gasp) she would be welcomed to have her Wedding in his church.
That started the buddies cackling again but the Pastor was right. Unless you know for a fact that a
certain color or style was chosen as an act of defiance instead of a personal choice, you have no right to say anything against it.
The Pastor of our Roman Catholic parish even brought up the old Jewish saying that all babies and all Brides are beautiful in the sight of God.