valentine's day How does one look cute in 20 degrees?

This is the question I am asking myself while planning my trip to Chicago this weekend? For the Bachelorette Party Saturday night, I want to look hot even though I'm going to be freezing my bootie off.

Now I did go to college in the Midwest and would wear my black mini, back-less shirts, and knee high black boots in the snow, who didn't??? But I'm much more mature now. So I want to wear my cute backless BCBG dress (still rocking the backless, suppose so). I never like to take expensive coats to clubs, I have a fear of it getting stolen, so I thought maybe just a cheap pashmina from Target would be ok? I can wear tights too, like that really going to make a difference...

HELP ME, I know I have Chicago readers out there. My blood is thinned out living down here and I need help. My friend Lou (who's party it is) has been living in the South as well for a couple of years, and we're both freaking out about what to wear...