Purple PJ Fix

I wear sewing project #1, the purple pajamas, on an almost daily basis in the colder months.  They are by far the warmest pajamas I have found to date.  For the second time now, the pajamas have come up with a hole in the center seam.

Knowing how these particular pajama pants were constructed, I dug up the purple thread and threw them on the sewing machine to stitch them up.

What I don't know is why this keeps happening.  On a basic level I realize that these pants get a lot of wear, and being so loose, especially have a strain point at the center seam.  But it seems that there should be a way to reinforce the seam so that would make it stronger.  So this time, I sewed two seam lines in the area where the hole occurred.  I didn't get the straightest seam in the world, but the pants are way too loose for that to ever be noticeable.

We'll see how that holds up.