Stitches Ripped

When my son was much younger I knit him an almost complete balaclava but I never finished the face edging. I don't remember why, but probably he didn't want to wear them anymore. I need to knit him some gloves as it is difficult to find ones with long enough fingers and I remembered the balaclava. As you can see it no longer fits him! I've undone it all, washed it and it's drying now. Hopefully I can start them on the weekend. I don't know what wool it is so I don't know what size needles to use. Which is a pain because I'll have to keep asking him to try them on!