To layer clothing effectively for winter, start with a moisture-wicking base layer made of merino wool or synthetic fabric to keep sweat away from your skin. Add a mid-layer such as a fleece jacket or wool sweater for insulation and warmth. Top it off with a water-resistant and windproof outer layer, like a winter coat or parka, to protect against the elements. Ensure that each layer fits comfortably over the other without restricting movement, and consider accessories like hats, gloves, and scarves for added warmth. Layering allows you to adjust your clothing to stay comfortable in varying temperatures and conditions.