No, go on! This is fascinating!!
Well, prior to Queen Victoria, it was the tradition for royal brides to wear silver quite bedecked in diamonds and the like. Queen Victoria preferred somberness (even before Albert's death) and opted for simple white.
White had become quite popular surrounding the time of the French Revolution. At one time, women were seen as vixens, all descendants of Eve, and man's downfall. But at this time, women had taken on the innocent, childlike demeanor. In the thought of these times of revolution, it was very popular to return to classical ideals (Pompeii had been found somewhat recently). With this, women began to wear toga-esque dresses, with a high empire waist, made of a light cotton. Chemise dresses had been popular post this dramatic fashion cycle.
With royal tensions in France, the 1780's brought in the popularity of the more democratic "peasent" dress, with democratic ideas also being felt from the infant nation of the United States. The change in society's view of women (that which I spoke of earlier) also championed the child-like, freer dress of this period, with, by far, the most popular colour being pure white.
Hence, Victoria's Choice of innocent, simple white. When she was married, extremely extravagant dress had not yet made it's big comeback, and she was nodding to those circumstances as well.
But when middle, upper-middle, and upper class Americans heard of the Queen's attire, they thought - now my daughter will be royal on her wedding day too! And so it began. Previous to this, all women, regardless of status, simply wore their Sunday best on their wedding day.
Since this happening in the late 1830's through the 1850's all sort of etiquette has sprung up about bridal wear. The funny thing is this - wouldn't it be a faux pas for a commoner to attempt to look royal?
For those of you intrigued by etiquette, I recommend "The Mirror of Graces". I think it was published in 1811, and it is fascinating to see how society has changed! The author speaks of how improper it is to 'dress above one's station, for merchant's daughters are being confused with duchesses!' (paraphrase)