FI's best girl friend is standing on his side with him, and I want her to coordinate with everyone else, but don't want to dictate what she has to wear. I don't think she should be in the same attire as the bridesmaids, and FI's family would freak out if she was in a tux or suit. Is it ok to ask her to choose any long black dress with a wrap/jacket, or should I provide a few options for her to pick from? Or are there other options I could consider?