While I encourage you to visit my shop Etsy shop, Midvale Cottage for lots of 1970s dresses (designer and otherwise), you can find the patterns for the two items illustrated above in the following Etsy shops:
For Vogue 2807:
We Are Vintage Sewing
For Vogue 2804:
Vintage Green Clothing
And while you are browsing Etsy, pick one or two accessories to wear with the dress, like a 1970s hat with net and a 1970s beaded choker!