There is a ton of vintage clothes at Poser World. I also bought some vintage addons for the MFD here. Also, those files at Poser World are for V2, but if you run them through Tailor, you can get them to fit V3.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi