My favorite website to find great vintage style fabric and ribbons is Reprodepot Fabrics. I used several of their prints for my wedding day, when we created table squares that went under each centerpiece. Its a great place to find fabrics with an era or style you are looking for. Go here to check out their blog.
Here are some of my favorite designs... (click images for link to product)
They also have some great ribbons... buttons... and patterns