I stitched this skirt for my daughter, but the elastic in the skirt was always twisting and I stopped putting it on for my daughter. It was sad because it looked great on her. I've sewn another skirt with flat front and used the tricks and learning there to correct this one, so here it is how I fixed it.
If you sewing up a waistband with elastic I'd recommend to this tutorial which shows how to insert elastic at the back while front is flat. The same can be applied for a full elastic as well.
here where I stitched on top edge of the waistband. It helps to keep the elastic in place. Here I went a step further. I'm showing the steps below
1. Straighten elastic:First I straightened up the elastic in the waistband by pulling the waistband and skirt away from each other. It took a good 10 minutes. Had I put it on again it would twist.
2. Edge stitch waistband on top of elastic and fabric:I then stitched the top edge of the waistband as close as possible to the edge. Because the elastic in the skirt was tight inside the waistband I had to stitch on top of the elastic, else like here I'd have stitched the top edge before inserting the elastic which I actually prefer.
Pull as you stitch. Sorry I didn't take with my hands but you can see in below pic.
3. Stitch in middle of waistband:Do another round of stitching running in the middle of the waistband (yes, on top on the elastic) pulling on either sides so the fabric is not gathered. I have to admit it takes some energy to do that.
I'd normally mark the center and quarter points of the waistband and elastic to align correctly, but since it was already sewn, I had to make do.
The free skirt patterns - gathered skirt free pattern and pleated skirt free pattern both have elastic at the back and I've finished off using the same method.
How do you avoid elastic turning inside skirts, pajamas?