Necklaces tangle easily, especially during travel, and untangling them is frustrating. Pack them in plastic wrap to keep each necklace separate and ready-to-wear once you arrive at your destination.

'Throw me somethin’ mister' has long been a Carnival-time mantra in New Orleans, as parade-goers vie for glinting plastic necklaces tossed from passing floats. But in recent years there’s also been ...