[Mithalwen]

Well I guess it depend what you are used to .. in many countries they would see our white dresses and associate them with mourning ..and even with relatively similar cultures, you can have differences, for example, I find it very odd to see American weddings on TV and the bridesmaids going up the aisle ahead of the bride....

Monochrome doesn't seem elvish to my mind.... despite the evidence of Galadriel and Nimrodel.... I would think there is a case for blue being a likely colour. It is "natural" but not as unobtrusive as greys greens and browns so more appropriate for special occasions, it suits their colouring and is the colour of the heavens and so perhaps worn as a token of veneration of Manwe and Varda who are named as witness at the marriage ceremonies which presumably since they followed a feast were held in the evening.