hebden those are all so cute! i think #2 is especially festive, that's a really fun dress.
i remember going to a christmas party in chicago when it was -10F. and i'd just come from california, so it was almost a mind-altering experience, that cold. i survived by layering my dress over some velvet pants with two pair of tights underneath. and a big fur trapper hat. brrr.... but i'd say layers are the way to go!