I have a pair of denim blue jeans that are still in good shape except for where my thighs touch. There they are really worn on one side and there is a hole on the other. Because of where the hole was located, I wasn’t comfortable even wearing them around the house, so I decided to try a simple fix.
First, I ironed lightweight fusible interfacing on the inside of the worn areas, making sure to completely cover all the worn out spots with the interfacing.
Once it was fused and cooled down, I turned them right side out. Using a narrow zig-zag, I stitched back and forth over the hole and worn areas. This serves to secure the interfacing and add strength.
If you can, drop or cover the feed dogs on your sewing machine in order to be able to move the jeans freely under the needle. The machine I used doesn’t have a way to drop them and I don’t have the special foot plate to cover them. Instead, I used a combination of repositioning and forward and reverse stitching to make it work.
Depending on the location, you could use contrasting thread and decorative stitches to turn the repair into an embellishment.
I also have a pair of jeans I love, but they needed a button sewn back on. They were also always a little short, so I replaced the button and let out the hem while watching TV one evening. These are heavier denim, so it will be another month or two before I can wear them much, but at least they are ready.
These have an obvious line where the hem used to be, but they’re cute so I don’t care.