The Roman Catholic custom of women covering their heads, usually with a lace mantilla (called in America a ‘chapel veil’) was obligatory under the 1917 Code of Canon Law (which was superseded by the 1983 Code). The practice goes back to the primitive Church and has been rediscovered by many women who attend the so-called ‘Extraordinary Form’ of the Catholic Mass (also known as the Latin Mass).
It was the apostle Paul who insisted on head coverings saying,
If anyone is inclined to dispute this, we have no other practice, nor do the churches of God.’ 1 Corinthians 11:16
Evangelicals, by and large, despite their very high view of the Bible, tend to ignore this teaching completely. Here is a beautiful example of the lace mantilla head covering worn by traditional Catholic women:
A ‘Powder Pink Pearl Lace Hijab’: