You have the choice when you make this skirt. It knits the same no matter which style you choose, but the way you block it dictates the result.
If you block the hem flat, it will give you a smooth, flared look. If you block it lightly or not at all, it will remain ruffled. It’s up to you!
The way I designed this skirt, it uses two colors of yarn for a nice contrast at the waist and hem, but you could make it all one color, or do stripes or go wherever your imagination takes you.