Q: One of my bridesmaids keeps complaining about the dress I had in mind for the wedding party. How should I handle her?
A: As the bride, you have total say in what your attendants wear. As a decent human being, it's nice to try to keep their feelings in mind. However, you can only do so much and the larger the group, the more difficult of a task it will be. Once you have made all the respectful concessions (asked your bridesmaids what they would like, considered their budgets and figure types, allowed them to make a final dress selection from two or three possibilities), it's time for them to shut up and be supportive.
If you've got a bridesmaid who continues to be blatantly obnoxious, simply state the following: "I'm sorry you're not happy with the dress. Although I'll miss having you in my wedding party, I'll understand if you want to back out. Is that what you have in mind?" Nine out of 10 women will insist that they still want to be your bridesmaid - and will put a lid on it. If yours happens to be the one that backs out, it's her loss. You do not need friends like that anyway.