Older people, particularly elderly mothers, have a lot of rules for weddings. In the last few years I have been warned off: wrap dresses (too casual), jumpsuits (disrespectful), green, blue (what bridesmaids wear apparently), bare shoulder, bare knees, flats, green, cleavage, red, black, white (despite it being expressly requested), clutch bags (disrespectful: how will you take your sugared almonds home or carry DH's things).