Not all bantams have it bad in winter. Logically an LF will stay warmer longer than a bantam just because of size. Most bantams don't need special treatment winter. Minus a few breeds like sermas and modern game bantams. My Cochins and white rock bantams do great
Good to know. I have my 1st bantam - a black orpington. With all her fluff she looks almost the same size as my EEs. My guess is she'll be OK, b/c she usually nestles between the bigger chickens. My only worry is my roo & the 2 hens with thin pointy combs.