hairpiece(n = noun.artifact) false hair, postiche - a covering or bunch of human or artificial hair used for disguise or adornment;
is a kind of attire, dress, garb
has particulars: afro-wig, switch, toupe, toupee, wig

   a covering or bunch of human or artificial hair used for disguise or adornment; a toupee. [WordNet 1.5]

hairpiece, n. a quantity or switch of detached hair used to augment a person's natural hair.