Bridesmaids can be married girlfriends or close friends. In terms of duty, as long as you can help the bride, you can become a bridesmaid.
Bridesmaids can be married, but it is also best to refer to local customs and the advice of elders.
Although in the eyes of modern young people, there are not too many restrictions on the marriage of bridesmaids, as long as you can perform the duties of bridesmaids in the process of preparing for marriage, as well as the wedding day, to assist the bride, then you can become the candidate of bridesmaids.
However, some local customs, as well as the traditional concept of the older generation, are inclined to require the bridesmaids to be unmarried, because the married woman as a bridesmaid is not a good moral, and if you choose a married woman as a bridesmaid, it is easy to limit the choice of best man.