Coverings, prayer veiling, scarf
Wearing a covering is based on a scriptural principle from I Corinthians 11: “Any woman who has her head uncovered while praying or prophesying dishonors her head, for it is the same as if she were shaved.” Because Mennonites believe that we should be ready to pray at all times (“Pray without ceasing”), some persons believe that women should have their hair covered at all times. However, in most modern groups the women do not wear a covering.
Among Amish and conservatively dressing groups, here is a link to some of the various styles of bonnets and coverings and what various colors signify, or regions represented. Scroll all the way down for more: http://www.quakerjane.com/spirit.friends/plain_dress-caps.html.