I bought a very simple, unlined skirt at a yard sale recently. It was two sizes too big but I figured it would be a great practice alteration project. I found this tutorial which was so helpful.
My skirt was a very simple fix. It is a simple A-line shape with a side zipper so I did not have to deal with the zipper at all. I made sure my sewing machine was loaded on top and bottom with matching thread.
I put the skirt on first, and pinned the waist where it fit me comfortably. I needed to take in four inches at the waist. I detached the waistband at the back seam for a width of about 8 inches. I severed it along the back seam line and pinned it out of the way. I then opened the back seam of the skirt about 10 inches. I pressed the seams flat and removed all those little threads left from seam ripping. A lint roller is helpful with that job.
At the top of the back seam, I measured two inches on each side of the seam and made a mark. I put the skirt panels right sides together and pinned them. I drew a line with a chalk pencil from the top mark, and tapered the line into the existing seam. I sewed along this new seam line, and tried the skirt on to make sure there were no unsightly bumps.
The last step was to take in the waistband strip. I pressed the waistband strips flat. I measured two inches on each side of the cut on the waistband, put right sides together and sewed along my marks. I trimmed off the extra fabric, and pressed the new seam open. I sandwiched the waistband strip back around the body of the skirt , lining up the waitband seam with the back seam of the skirt, and stitched it back on, sewing thru the back and front with one seam.
I have to admit that I would usually have just thrown in a couple of messy pleats (or even safety pins, lol), and covered it up with a long blouse. I am so glad I took the time to do this simple alteration on this skirt. I looks very professional, and it only took about half an hour. The waistband seam is nice looking enough that I can wear it with a shirt tucked in.