We're having our wedding in the evening in a city in which it snows (a lot!). Many of the pictures will be taken when the sun starts to go down (not full light), and because of the season and our venue location, the background will be old stone buildings and snow. Given all this, I'm wondering what colours will look best on the bridesmaids. I've been thinking of asking each of them to choose a black cocktail dress. Thoughts or suggestions?