I've noticed a few dresses in this style in the stores. The construction looked simple so I decided to try one myself. This is my first unlined dress! I thought a lining would be too bulky, and I didn't really know how to/want to draft facings. I got the fabric at the thrift store for $1. I have no clue what fiber it is, but I liked how it was more flowy than regular cottons.
Anyhow, it's super simple. Just a baggy t-shirt on top and a rectangle for the skirt. The elastic is sewn into the seam allowance at the waist. I had problems with a gaping neckline, but I fixed that by handsewing a pleat at each shoulder, and at the center front neckline. Because of the patterned fabric it's basically hidden.
If I had any modeling potential I would pose better, but I'm honestly the most awkward model ever!