Mccall pattern dating
For many years it was the only book available, and you still can track down a copy for quick, hard-copy reference.
But its popularity declined after the publication of two Blueprints of Fashion books, one covering the 1940s and one the 1950s, by costume designer Wade Laboissonniere.
Some sites will be a better fit to your collecting taste, and some are updated more frequently than others.
Narrowing your focus helps because you can learn about and recognize patterns in your chosen area much quicker than if you try to digest the whole range of sewing patterns made since the 1860s.
You'll find an extensive selection of great patterns for or less; most exceptional patterns for under 0, and virtually any sewing pattern ever made for less than 0.