You bought three delicate gold chains. You put them on. They tangled into a knot that took ten minutes to undo. What went wrong? Layering necklaces isn’t random. There’s a system. Ignore it, and you get a mess. Follow it, and your neckline looks intentional, expensive, and effortless. Here’s the system. The Three-Length Rule: Why 16, 18, and 20 Inches Work The most common layering mistake is wearing chains that are too close in length. A 16-inch and a 17-inch chain will sit almost on top of each other. They’ll tangle because there’s no space between them. You need a…