Considering the festive time of year, instead of The Little Black Dress, how about a little red Francesina slipdress from Cotton Club's from their 'Silk of' Collection?
Should the occasion lend itself to more than the straps slipping, it wouldn't be a bad idea to coordinate what's underneath with their Erina push-up bra and thong panties..
Or try a closer match of their Francesina bra and panties
And if this particular slipdress doesn't quite seem 'outerwear' enough, you can always save it for a party of two.