This is what the skirt will look like when it is done. I added some white lace all across the bottom after this picture was taken, and it looks real cute.
I am going to take these two pairs of pants that no longer fit my daughter, and make them into a long skirt for her. I chose these two because they are of similar weight and the colors match. You can use two pairs of blue jeans that are too short or too tight in the waist, if as a skirt the waist can slide up a bit and fit just fine.
I will use all of one pants and part of the other. I will use the entire pair of the solid colored pants for the skirt top and sides, and the striped pants will provide a panel to fill in the front and back of the skirt. (If you are making a shorter skirt you would only need one pair of pants and you would cut off it’s legs a foot or so to fill in the panel.) The top part of the second pair of pants that will be left over can also be used to make another skirt by sewing a length of cloth in place of the legs.

Lay your pant leg out flat inside out so you can see the inside seam (the inseam). It is a waste of time to use a seam ripper to rip this seam, so we are just going to cut the seam right off! Start at the bottom of one leg. Cut up the inseam, cutting off the seam all the way up across the crotch and back down the other pant leg. This opens up the pants. If you put them on now they look like a skirt with a triangular piece missing from the front and back. We will us the lower part of the pant legs of the other ( striped ) pair of pants to fill in this triangle. The cat is not really necessary for the work, although she thinks she is helpful!

What the inseam looks like as you are cutting it off.