I'm wearing about 7 lbs of jewelry here. I'm all for minimal jewelry, but I don't think that being minimal means being weightless. I think absolutely layer those heavy chains and large statement pieces! If done right, it can look effortless and cohesive. Work with the same like-colors, such as all gunmetal and silver, and play with layers, being sure to hit multiple points on the body, not just focusing on one area. Make it look like your jewelry is cascading off your body, not like you're wearing large restrictive pieces. The look you're going for is glam, not S&M. Unless that's what you're into, then by all means, wear that chain choker and collar and body chain all at once.