Ruined a pair of old knit shorts I used to clean and paint around the house. Almost went out to Kmart or somewhere to replace them but decided to use a Benetton USA super oversize T-shirt that I received as a gift for a purchase over 15 years ago. I hardly ever wore it, way too big, no time to sew before now. The following is how I used a large pajama bottom pattern to make them into a pair of much needed slouch and sleep shorts. Very comfy!
Step 1: Lay out the pattern.
Once you find a large enough T-shirt, this one was a long XX large, just lay out the 2 pajama bottom or short pattern bottoms that allow for an elastic waistline. I had to overlap some of the pattern at the side seams, but not by much and the pattern was large to begin with. I just knew to be sure to make the seams a skant 1/2" instead of the usual 5/8".
Step 2: Cut Out the pattern and Stitch.
This is a very quick project and once you cut the pattern out, you will stitch up the front and back of the pieces first, then you will stitch the sides, joining the front and back panels, as well as the crotch area. Clip the curves on the front and the back crotch area after sewing. Since I was working with cotten knit, I used a stretch stitch to allow for more give in the seat area. It is a good idea to double stitch the seams if your machine does not have a stretch or knit stitch for extra reinforcement. You can see that I cut into the neckline of the T-shirt as part of the pants, but that this ribbing will be on an inside seam.