I used to knit regularly and I thought that I remembered how to knit mittens. The mitten on the right looks ok from the backside, but it was too narrow across the hand and the thumb opening was huge!!
I admitted defeat with the mittens and got out a knitting book, made some calculations and started again--this time with a pattern and a decorative stitch. That's the mitten on the left. I like the decorative stitch, I really do, but it doesn't show the colors of the yarn very well.
Both of these mittens got ripped out or frogged and I started again. I got the body of the new mitten (knit with a pattern, but no decorative stitch) done and had my daughter try it on for size.
The first words out of her mouth were, "Mom, it's itchy".
At which point I gave up knitting these mittens for her, and found some scraps of polar fleece and made this bright pair of non-itchy mittens:
Hooray for non-itchy fabrics!