Hair
Human hair can be cut and arranged in a variety of styles, and in modern times is done so almost exclusively for aesthetic the Renaissance. Most wigs are made from human hair, not animal hair as is popularly believed.
Animal Hair
Animal hair, was however, commonly used in many things. Horsehair was often collected and turned into fabric, string, or used as decoration, particularly on helmets, as was [camel]] hair in warmer climes.
Fur
Animal hair which grows short and dense is called fur,and a whole skin with the fur still on his called a pelt. A skin with little hair was usually called a hide. In heraldry, various background patterns are linked to animal furs, e.g. ermine. These are regarded as tinctures.
Hairstyles in the SCA
In the SCA, hairstyles are generally modern, since the re-enactors have to go back to their mundane lives after an event. If you see a person in an authentic medieval hairstyle (especially something extreme like the semi-skinhead Norman forelock or a braided viking beard), be impressed.