What color and style of dresses do the mother of the bride and mother of groom wear for a formal wedding?

The mother of the bride should wear a color that blends and complements the bridesmaids' dresses, but does not match the exact color. Avoid all black or all white. The "mob" usually selects her dress first and then describes it to the mother of the groom, allowing enough time for her to shop. Both mothers can wear the same color, but not the same dress (preferably they should be the same style and length). For a very formal, large wedding before 6pm (over 200 guests): long or short dresses, not quite as formal as evening wear. For a formal wedding before 6pm (100 or more guests): elegant dresses or suits. In any event, both mothers should go with dresses that look good on them (color, figure size, personal sense of style, etc.) and they do not have to match.