If your grandmother is anything like ours, she probably bestowed this very important life lesson on you: Never skimp on two things — toilet paper and scarves. There’s nothing worse than running out in blistery, hair-whipping weather only to find out that your winter tippet may as well be a pocket handkerchief for all the good it’s doing you. Take a cue this season from designers like Peter Pilotto and Christian Dior. Oversized, warm wraps are the way to go. Besides, we’re not going to cross nana. Are you?