For all the different types of finishing the circle skirt, I've created a separate post which is more generic - 4 ways to hem circle skirt.
You can use any of the methods, my favorite is the double fold method which I'm going to show you here as well as the tutorial was only using miniature fabric pieces.
I've also finished the hem in the most simple zig zag finish method for the nirma skirt that I finished well under 1 hour.
For full instructions to make a Nirma skirt pls goto NIRMA SKIRT FREE PATTERN.
We are trying to sew a larger piece of circle onto a smaller circle - because this essentially is a circle skirt. So this method is quite a complex one and involves a 3 times stitching and 2 times pressing.
Detailed steps below:
It needs to be put cut evenly - not like mine :)
bias fabric its really easy but when you come to non bias side you may need to place in a tuck for the upper fabric to be accommodated by the lower one. The pins that you have placed randomly is a good indicator if you are running more on the upper fabric.