According to early Christian traditions, what was a newly-married couple supposed to show off the day after the wedding night?

Explanation

The wedding night used to be pivotal for Christians. Tradition held that the married couple should show off a blood-stained white sheet the day after to prove that the bride was a virgin, and that the wedding had been consummated. If her virginity was not intact, the bride's mother often helped to produce a blood stain. The tradition is still in use in some parts of the world.