Free vintage patterns are online. Everything from evening gowns and 70s tunics to M.C. Hammer pants.
http://mymodernmet.com/free-vintage-sewing-patterns/
Over 83,500 Vintage Sewing Patterns Are Now Available Online
The Vintage Patterns Wiki boasts over 83,500 vintage sewing patterns from the 1920s to 1992. It's possible to browse by year or garment type.mymodernmet.com vintage evening gowns