I don't actually know what kind of fabric this is. It's a jersey knit with cotton and spandex and maybe something else. I got some leftovers from a warehouse and they used it to make yoga shirts so it's flexibility and returnability is amazing. It really is an awesome and comfortable fabric. It's a black and charcoal heathered color.
I also built in some simple shapewear to the dress since my fabric was on the thinner side. For both the front and the back I cut extra pieces that went from the empire line to just under my hips. I didn't finish the edges and just sewed them into the dress as if they were combined with the dress piece. To prevent the fabric from rolling I hand sewed a catchstitch (a stretch handstitch) on each unfinished edge. (I really tried getting a picture of the handstitch, but it blends in so well even on the inside.)