Circle skirt construction is pretty easy you just need to know a little bit of geometry. One simple formula how to calculate the radius knowing the length of a circle is all the math you have to know.
Sewing is not complicated too. It requires few pieces and basic techniques, making it is a good exercise for beginners. If this is your first time I would advise you to begin with a paper pattern. For experienced sewers this step can be skipped, you are welcome to do the markings straight on the fabric.
Circle skirt construction math.
To make this pattern you will need only two measurements – waist girth and the length of your skirt. This will allow you to calculate the radius of the circle.