At my house, hats, mitts, and scarves are all washed pretty frequently. Even those of the adults. Sand and such that is spread on the streets gets into the air, and then into your clothes. Cleaning the snow off of your car, waiting for a bus, etc. puts you in contact with all that stuff. Unless the winter is very mild, salt isn’t quite so much of a problem like it is out east, but still a concern. Even things like going in and out of stores, and the temperature changes can create a lot of sweat, which will also get your things dirty.
The Bernat Denim is a worsted weight, but I have used chunky for a lot of things too. If I’m not using them for driving, chunky/bulky mittens help keep my hands warm and aren’t uncomfortable. I don’t know about gloves since I haven’t made any. I have used cotton quite a bit with good results as well. It dries quickly when put on to the heat vent in the kitchen! I have a pair of wool mittens on needles right now that I’m going to be afraid to use, since I have no idea how I’ll wash them! When I was at Ram’s once, one of the clerks showed me a pair of felted mittens she had made that had an eyelash cuff; so felted items would be suitable too as long as you are willing to handwash them when they need to be.
Sorry for rambling on.