My wedding planner recommended black dresses to match the other colors within the wedding. The black and white linens and the fuschia of the invites and flowers but black seems like such a safe color. I love black, it's probably the one predominent color in my wardrobe but I also love the bright jewel colors of the flowers and want to have a bit more fun with the dresses. I think the combo is great but need to think about it a little more.
1. the girls will actually be able to wear them again (other weddings, new years eve, christmas parties, etc)
2. black is flattering on EVERYONE
3. it's such a classic colour that when we look back on our pictures in 20 years we won't have that "what were we thinking?" moment
4. you don't have to worry about matching a specific shade of colour to go with your decor. black is black.
you could always add pops of colour with their bouquet, shoes, accessories, etc...