The comfort aspect depends on the quality of the material, which will need to be light. It also has to do with how the skirt glides, to make it easier to control.

The way in which it glides depends on the metres of fabric and the quillas (seams) that the skirt has. Quilla is the name for each of the vertical seams that unite each of the pieces of fabric that make up the skirt. The more the quillas, the better the skirt will glide.

In order for the dress to look good and for the figure to appear well drawn (shaped), it is important for the skirt to hang well. This can be achieved through the material, gores and ruffles that are used. The gores are pleats made of material cut into layers, that are added to the lower part of the skirt to make it heavier and to make it glide better.

Choosing the skirt with or without ruffles depends on one´s own taste. If you like ruffles, one or two will be enough, don´t exaggerate.
As for the price, it will depend on the quality of the material, the metres of material that are used, and the amount of work that the skirt requires. If you don´t want to spend a lot of money at the start, choose one that is made of knitwear, but it should also have enough quillas. Don´t hold back on the amount of material that is used, or you will look dull.