When you order a color swatch, it includes every fabric that can be made in it, excluding lace and other specialty fabrics. Swatches can be found here for US customers and here for Canadian customers.
Each of the included fabrics will be listed on the swatch in the order that they appear in the swatch. Generally, there will be only 1 layer of each fabric but if Tulle is listed on your swatch, there will be 2 layers because it is so sheer.
In the screenshot below, we can see a close up of the top of the swatch that lists the fabrics included in the Mulberry swatch in order: Chiffon, Liner, Satin, and Charmeuse.
To get an idea of how your dress will look, just hold the main fabric type your dress is made with (Chiffon, Satin, etc.) over the lining fabric on the swatch. While most of our dresses do have two layers of lining and one layer of the main fabric on top, this is the best way to see how the dresses will look once they arrive.
If the color you want comes in Mesh, you will be sent a separate swatch that includes Mesh and Stretch Lining, which we use for the majority of our Mesh styles. You would just hold these two together to see how our Mesh dresses would look in that color.
To get a better idea of how the dress will look, I highly recommend ordering any sample dress in your chosen color.