Well, I did it... I made myself a TX mitt from those plans. Mom was up to visit from FL to see her grandson, so I got her to give me some sewing lessons while she was here! Here's some pics of it. Seems like it will be pretty warm, I guess I'll see this weekend (hopefully). Used black cotton "duck" fabric for the outside, and navy fleece for the inside. I really wanted some cordura nylon for the outside, so it would be waterproof as well, but Walmart had none. Don't really plan to use it while it's raining/snowing anyway, so this thick cotton "duck" fabric should do fine.

Need to make the bottom a little wider next time... had to stop the side stitching a few inched from the bottom so I could angle my arms into the mitt... it would've been too narrow otherwise...