LBD HELP

Ok, so I should know what to wear with a little black dress (LBD) but I don't : ) Corinna's bachelorette party is Sat night and the dress code is a LBD, but I'm still a little sick and I'm sure it's going to be cold. I can not figure out what to wear over top to keep myself warm that will look cute since I am the only single one that's going to be there. I really don't have anything so I would have to go get something......the only think I do have is a 3/4 sleeve cardigan. Any Suggestions?!?!?!?!