Sherpa dog makes a good point.
I do that with my heavy parka. The string goes through the arms and the little loop that is behind the neck for hanging it up.
I tie mitts on the end of the string.
If my fingers get cold, into the mitts they go.
If I need fine finger control the mitts can dangle, or even be stuffed up my sleeve for a moment.
Edit:
If you decide to sleep out and use the tent remember to brush the snow off everything before putting it inside and brush any snow that got inside the tent out before it melts.
If there is frost on the inside in the morning it should be brushed out before it melts too.

I like Be Prepared's comments about the ensolite. I carry a slightly larger than normal piece for sleeping on but I made it out of scraps from pads other people had wrecked. I taped the pieces together into a pad that folds flat instead of rolling into a tube. I kept a smallish piece of the scrap as a sit down.
I will still try out Sherpadog's suggestion of a fleece towel.
Maybe my old one size too small blanket for that.