The thing about winter in central to coastal Texas is that it can be quite variable. We had a week of cold, cold overnight temps in the 20's-30's over a week ago, and as we speak, a leaking underground pipe (froze) was just discovered a few days ago in our yard, and being repaired now. Years ago my mother and I visited my aunt and cousins in Corpus in early October. We knew a "cool front" was coming to Austin but never would dream of it coming all the way down to Corpus. WRONG. Had packed only summer clothes, so had to go buy a pair of long pants and a sweater, for I was covered in goose bumps. I think your wool batting sounds great. My mother never likes anything heavy on her feet either. She is 91.