Can people wear clothes with 9 buttons?

In Chinese traditional costumes, buttons are singular. Generally speaking, there are 9 adults, 5 teenagers and 3 children. Avoid numbers 4 and 6. In ancient times, there was a taboo custom of "men don't show their navel and women don't show their skin" in clothing. In addition, in the number of buttons, the singular number symbolizes auspiciousness.