hairpiece vs postiche

hairpiece

noun
  • A false substitute for a person's hair; a toupee or wig. 

postiche

noun
  • Any item of false hair worn on the head or face, such as a false beard or wig. 

adj
  • Added after the work is finished. 

How often have the words hairpiece and postiche occurred in a corpus of books? (source: Google Ngram Viewer )