No, you wear a wedding dress on your wedding day and an evening dress at night. There should be no conflict. Your mother was also an important person when you got married. Mom should dress up beautifully, too. It is right to dress differently from others. Do you want your mother to wear a big red cheongsam with a big phoenix pattern after you get married? Do you think mom will wear out at that age? Generally speaking, you wear red to represent good luck and celebration. Besides, after you get married, you will spend less time with your mother, and her mother will miss you. So when you get married, as long as she likes her and is happy, let her wear it. There is nothing inappropriate. If you think her mother stole your thunder, you can buy her a red one and ask her to change it the next day.