Roman Catholic Churches have always had a dress code, dating back to the earliest centuries. However, since the 1970s, the application of a dress code has loosened in most cases, especially for women. In the whole of Vatican City, the basic clothing guidelines are centered around modesty for both men and women.
Since it is believed by Catholic tradition to be the burial site of St. Peter, the chief spiritual leader of Jesus and the first Bishop of Rome, St. Peter's Basilica is considered one of the holiest Catholic Churches in the world. For this reason, modest clothing and skin coverage are a must at the Basilica.