I am mostly finished with knitting a mitten. All that is left to do is to stitch up the hole at the base of the thumb. How do you usually stitch them up?
I use the tail of the yarn that I use to knit the thumb with. I always leave a long tail after attaching the yarn just for that .I will slip the needle through that hole and pick up a stitch and pull it towards the hole and tighten the yarn so no hole remains.