Why do some people say that bridesmaids can't marry?

In the old society, when a woman got married, it was very important to choose a suitable young woman as a bridesmaid and send her to her husband's family. This bridesmaid, also known as "seeing off a female guest", has strict conditions: besides being young, she must be beautiful and have a son. If she wants to look among her peers, she should first look in her own family. Can't remarry yet. Calling it "America" or "America" means perfection, so that married daughters can live a happy life. After finding such a candidate, some people will tell her fortune again to see if there are any obstacles. There are some inappropriate ideas in this, but anyway, it is always a big deal for a daughter to get married, and it is really sloppy.

References:

Cultural folklore

But customs vary from place to place. We have both married and unmarried people here.