In your search, don't focus so much on vintage that you overlook patterns that aren't necessarily a vintage look but the structure is the same as it was in the 50's and 60's.
There are really only a few basic patterns. From those, it may simply be a difference in neckline, collar, sleeve, etc. that makes it different from another one. So reduce the style you like to the actual structure of the garment and you can vintage it up to your heart's content.