No, that’s such an old-fashioned idea. It’s totally fine to have a bridal party consisting of mixed friends. Because what if the bride’s friends are guys and groom’s friends are girls? You’re welcome to have bridesmaids and groomsmen or bridesmen and groomsmaids. A lot of couples invite a best woman and a man of honor. Gender doesn’t matter, only friendship matters. Don’t be afraid to break the established rules.
