About a month or so ago, I got my son to go to the fabric store with me. On top of that, I convinced him to pick out fabric for a couple of things I would make for him. We both left alive and still on speaking terms. It was almost a miracle. One of the things Tucker spotted was some flannel that incorporated two of his favorite things: camouflage and John Deere tractors. I suggested pajama shorts, then realized he had grown so much that none of the patterns I had used before would fit him. I almost lost him in the pattern section, probably because he was getting hungry, but we finally agreed on one. He wanted lots of pockets, for what I don't know, and most pajama patterns for adults skimp on the pockets. We ended up going with a Simplicity pattern for hospital scrubs instead.
As you can see, there are no shorts on this pattern. He wanted them to hit his leg below the knee, so I held the front pattern piece up to him, marked where we wanted the bottom of the leg, added 1 1/4" for the hem, and cut off the rest. I measured the cut-off portion and used it as a template to cut off the required amount on the back piece.
I made a few changes to how these were put together, the biggest being instead of using ribbon or twill tape to create a casing, I just folded the top edge under 1 1/2" and under again 1/4". It lowered the waist, which my kids always seem to want. I completely skipped the drawstring and just used elastic. I didn't place the side pockets using the pattern markings, I just put them on where I thought they looked good, which turned out to be 4" from the raw edge.
The moral of the story is, don't forget to consider unusual options when looking for a pattern. The other one is, if you're going to take a teenage boy to the fabric store, bring snacks.