If you think that it's something that a mainstream pattern company would have (like Simplicity or McCalls) go to their websites and browse:
http://www.simplicity.com/
http://mccallpattern.mccall.com/
http://butterick.mccall.com/
http://voguepatterns.mccall.com/
They don't have that many patterns that you couldn't just look at each image rather than trying a keyword search.