Welcome Stitchitgirl. If you really want to make it there are lots of different ways. Some very simple where you just gather it all up and use an elasticated waist. That can get a bit bulky. This pattern from Simplicity uses a fitted yoke and would be comfier. https://www.simplicitynewlook.com/8456
I would personally use chiffon rather than tulle, which can be a bit scratchy unless you extend the yoke and make it a lining. Here are some instructions I have used in the past. http://www.burdastyle.com/projects/the-50s-petticoatThis is a nice quality Chiffon in lots of different colours https://www.minervacrafts.com/shop/fabric/bridal-fabrics/th-cg-m-plain-chiffon-dress-fabric?colour=Black
I'd make a base petticoat in lining fabric, and add layers of net to get the foof required. You can be fancy schmancy and ribbon- or lace-edge all the layers, but if you want volume, use net