Today, Too Much Declare steals from Slate, and becomes an Agony Aunt
"Dear Prudence,
My wedding is 59 days away, and I am concerned about my future mother-in-law's dress. She is a wonderful woman who makes me feel accepted as her son's choice for a wife. But with only two months left before the wedding, she had finally begun her search for a dress. Last Sunday, my mother-in-law held my bridal shower at her house. My mother told me that while she was there, she saw a photo of the dress my mother-in-law picked out. She described it as "young, low-cut, and flowing." I wanted to get to the bottom of this, as my mother-in-law had not even informed me that she had purchased anything. So, after the party, I sent her an e-mail, and she sent me a picture of the dress.
I couldn't believe what I was seeing. My 51-year-old mother-in-law has picked out a dress with a wispy skirt, a V-neck, and spaghetti straps. It's fit and styled for someone my age—25! And it's robin's egg blue—which doesn't even go with my champagne-colored dress, the bridesmaids' sage green, the chocolate brown tuxes, and my mother's pale pink dress. I can't swallow the fact that she would attempt such a daring wardrobe choice on a day so important to me and her son. This dress has been ordered and is not set to arrive until two weeks before our wedding! I really need advice on how to tell her that I do not feel it is appropriate to wear.
".
359Rabbit
Pro

Have you seen her in dress, it may look alright. To call somebody a slut just because she does not conform to your idea seems a little narrow minded.
I can understand that you want your day to be perfect but you can not dictate what other peopel will wear at yopur wedding. Or are you going to ban jeans, or maybe you can say if you come to the wedding if you are wearing a back morning suit other wise don't bother.
Get Real!