fabric question

[exquisitegeek.livejournal.com]

I have these really comfy, stretchy pajama pants from Old Navy. They're really thin, and because I wear them all baggy and love them and wear them all the time, they've developed a couple tiny holes on the back. Every time the pants get washed, the holes get a little bit bigger.

The holes aren't on a seam, but I thought I might be able to close them before they progress any further. I was just a little hesitant and worried about the stretchiness of the material. They're 95% modal/5% spandex. If I sewed them, would the thread just cause more tension and create more holes? Or would it be ok?

Share you wisdom with me. I don't want to kill my favorite pants.