I thought hippies were vintage. Unfortunately, sizes have changed a little since the 1960s. Even if you are an average sized girl, I think busts are getting considerably larger. So, you may be forced to seek custom clothing. Depending on your size, you may actually have to do this for everything. My late wife had to special order clothing just because of her bust size. Let's face it, there is a lot of discrimination in this area. The last hippies that I saw were coming down from Canada. Again, they were all smaller, but they had authentic clothing. Either they had a resource there or they made their own. I think, and let me stress think, there is still a hippie commune in Kentucky or Tennessee. I believe it was one of the first and it was still hanging around, in a modified form, a few years ago. If they haven't sold out, they should be able to fix you up. Try searching for hippies online. I'm sort of into that, I'm closer to the original than a modern version. After all, I did grow up around them. If you can sew, or are willing to learn, make your own. Women styles weren't that complex. It's not hard to tie-dye T-shirts, for example. Undergarments worn that common. It just depends on how authentic and offensive you want to get. Hey, the hippies are part of the reason that there are signs that say "no shirt, no shoes, no service."
Ebay, Modcloth
