The dress from the left is a gorgeous A-line, bateau, sleeveless gown with a lovely back detail (see below). The one in the right it's made of organza, has an ankle-length that is perfect for a wedding in nature, with your feet on the grass.
The left one can be worn easily at a wedding in the summer, the off-the-shoulder detail is my favorite. The right one is more appropriate for a winter wedding, has an interesting cut and with the right accessories can be the perfect dress.
The back of these lovely vintage wedding dresses is gorgeous as well.
You can find these beauties and many others here: http://www.dressv.com/vintage-wedding-dresses-c103387/.
