Let's talk for a moment about sumptuary laws, designed (to quote Britannica.com) "to restrict excessive personal expenditures in the interest of preventing extravagance and luxury." They started long before the Middle Ages. A province of Sparta forbade residents to own furniture or even a house that could not be made simply with an ax and saw. Anything more elaborate was excessive and shameful. Spartans only were allowed iron money, not gold or silver. Roman law also had rules governing the materials for garments.
Medieval Europe adopted many sumptuary laws, often to make sure the increasing wealth of the growing middle class did not encourage them to dress extravagantly similar to the ruling class. French kings restricted the use of gold and silver embroidery, etc.
Sumptuary law could embrace hairstyles as well. We know this because Florentine women in 1326 asked the Duchess of Calabria to speak on their behalf to the duke. The women of Florence were restricted (unfairly, they felt) from wearing "false hair": wigs and hair extensions. The law was intended to prevent lower-class women from appearing aristocratic—an affront to the fabric of society. Pope Eugene IV (1383 - 1447; briefly mentioned here) issued a statement that women should be allowed to wear "false hair." To be fair, his reasoning was that it could be pleasing to her husband and reinforce domestic bliss and marital fidelity, so a woman's satisfaction was not necessarily foremost in his mind.
Long and flowing hair was attractive and seductive on a woman, and so once she was married the hair had to be put under a wimple or bound up, so that she did not appear seductive to other men. The image of a woman combing long hair, in many cases being watched by a man, appears in medieval art, and is even painted on combs.
While combing [sic] the sources, I have found so much more regarding hair than I expected, including some items that might not be rated PG. More to come.
