customary (adj)

In my village, it is customary for a girl to take her mother's name.
It is customary to shake hands as a form of greeting in many Western cultures.
In some cultures, it is customary to remove one's shoes before entering someone's home.
Leaving a tip after a meal is customary in many countries to show appreciation for good service.
Wearing formal attire is customary at weddings and other special occasions in many societies.