By now you’ve probably seen the signs: Le Beaujolais Nouveau est arrivé! In practical terms, this translates into “Free booze at midnight!” Between the anticipation of this year’s batch and the excitement about tonight’s uncorking parties, it’s understandable if you haven’t considered what you’re going to wear. But to prevent tonight’s raucous revelry from becoming tomorrow’s dry cleaning disaster, check out our tips for dressing to swill. Oui: Dark colors and washable fabrics Non: Anything…