The first way is to actively make friends with children and narrow the psychological age gap between them. You can ask your children what kind of clothes you young people wear, and then try to choose their dress style, dress yourself younger and keep up with the trend of children. In this case, children are actually happier.
The second way is to chat with children directly and tell them that because their parents are old and don't like bright colors, they like this kind of quiet clothes with fewer styles. Mom and dad know the clothes and styles that young people like to wear, and you should also know the clothes and styles that mom and dad like.
Then it is a good choice not to judge each other's dressing style, respect each other and try to help each other choose clothes from each other's eyes.