the best thing to do if you want to sew mittens is to trace fitting mittens or use your hands with plenty of seam allowance. make sure you cut them out with the thumbs facing each other, so that you'll have the right side on both sides.
i zig-zaged the pieces together quite tightly, because even if they may not keep out rain and snow, they should at least keep the wind out. the trouble is i am now wearing them inside out, because they looked all wonky when i turned them right side out, so i left them as they are.
if i didn't mention it, could you tell that they weren't meant to look like this from the start?
i made some fleece liners out of leftover cotton fleece pieces as well to wear inside, just a bit smaller than the actual mittens. now my hands will be really really warm. too bad the forecast says nothing of snow in the next weeks.
but winter is still long, so i'm hoping for my chance of mitten-y snow action!