Kristen, have you tried wearing an open cardi in some nice color (cherry red, burnt orange, cobalt blue) and then putting a skinny belt over the cardi. You know what I mean? I have not tried this myself, but my really fashionable co-worker was wearing this the other day, and I really liked it.
Another idea would be a turtle neck in pretty much any color. I saw something similar in Lucky magazine, September issue, although the dress was a little looser. And you can kick it up a few notches with those gorgeous "shoes for all seasons" you got and some fun tights.
Both dresses fit you so well and are really beautiful. I think you can make them work during cold months. See how full of advice I am now that you all have given me great ideas for my problematic dress. :-)