Evening gown? Check. Tux? Check. Once you've packed your Coach Bleecker Day Tote in smart leather stripes ($698) for a bright-lights-big-city weekend, make sure your gift is equally outrageous. Surprise your hosts with the biggest damn bottle of bubbly they've ever seen—the gargantuan three-liter Billecart-Salmon Brut Reserve NV Jeroboam ($395).