One size, yes, but not most. I have a 40" waist with 45" hips and could barely get it on (but did). The surprise, though, was how short that made it. It's a great length on a thin build, but starts looking tutu-ish on hippier figures. Also, this is open all the way to the waistband, so if you want it at all modest (even just not showing your underwear), you'll have to sew a few of the under panels together or use some safety pins, along with leggings. Overall, very pretty and comfortable for dancing.