1.
The white gown actually does NOT come from Queen Victoria, nor from some symbol of purity.
The white gown was actually a innacted by chazal ???? ??? ????? ?? ?? ???? ??, not embarrass someone who cannot afford it. In the times of Chazal white clothing were the norm because it was the cheapest and didn’t require any dying of the materials.
The jealousy that the kesones passim which Yaakov gave to Yosef caused, wasn’t just that the brothers recieved a solid black suit and Yosef recieved a pinstripe, rather the entire jacket was made from scratch differently. The threads were dyed different colors, and the cloth was weaved custom made, showing the extreme love that Yaakov had shown to Yosef more than the brothers. Thus Chazal innacted the white gown to prevent embaressmant, jealousy, and hated.
2.
While the aisle at weddings may have a non-Jewish source, in todays day in age, with all the mixing of genders, could you imagine what would be going on if we in Amewrica did the Israeli style??