For me, there are skirts, and also petticoats. Here are all the skirt shaped garments that don't cross over into my historical wardrobe (or, they do, but only if no one can see them).
Long black skirt, 2007-ish
Super long, super full, made with tiers in different fabrics. The bottom-most tier was denim, because it hit the ground a fair bit. There was a hem on it originally, but at some point I just gave up and cut it off.
This was my main petticoat for most of high school, because it was long and full, and black. I thought I wanted to be a goth, maybe because that was the only alt-fashion that I was familiar with at all.