It was used to cover up their faces and to prevent from their hair going all over the place. Its just like a girl using a hair tie to put her hair up. Hope this helps.
Prelude to the French Revolution<span>: Monarchy in Crisis. As the 18th century drew to a close, </span>France's<span> costly involvement in the American </span>Revolution<span> and extravagant spending by King Louis XVI (1754-1793) and his predecessor had left the country on the brink of bankruptcy.</span>
Most people in that age believed strongly in God. The Catholic Church was the center of that belief, people thought that they could get to go to heaven only through the catholic church (god was the center of the universe)