There's nothing worse than adding a bulky coat to a pretty party ensemble or covering up my sequins with something drab. If you've ever seen a girl dashing from a festive fete with her North Face zipped up on top and a shimmery hem peaking out from below, you know exactly what I mean. So, when I spied Alessandra Ambrosio sporting a shimmery Roberto Cavalli trench, my eyes lit up. Her snazzy holiday outerwear is just what I'm after to keep things festively chic, even when I'm buttoned up. Now, picture this silky trench with your little silver dress . . .