As you prepare to go winter camping it is important for you to understand the basics of how to dress warmly. You've all heard many times that layering is important in any clothing whether it's the hot summer or the cold winter. Staying warm in cold weather is all about staying dry. Remember the 3 Ws of dressing for warmth: Wicking-Warmth-Wet.
Your first layer of clothing is your "wicking" layer. Because a person's activity level varies greatly throughout the day, it is important to prepare for the times when your body will be over-dressed and you produce sweat. To compensate for this, it is important to wear a wicking layer of clothing as your first layer of clothing. Wicking materials move the moisture away from your body to outer layers of your clothing leaving your skin dry and warm. There are many synthetic materials on the market today that perform this function. Wool also is a wicking material but can be itchy so is not commonly used. Cotton is not a wicking material. In fact, cotton is probably the worst choice for any winter clothing. When it gets wet it loses all of it's protective warmth.
Your second layer is your "warmth" layer. This layer traps your body heat and provides your body a comfortable temperature. Wool or down are both excellent warmth layers, as are many of the high-tech fillers available.
Your final layer should protect you from getting wet. Most winter coats provide layers 2 and 3 but fail to provide the important first layer, so prepare accordingly. Ski-pants also provide 2-3 but not 1, so get some good long underwear and you will be dry and warm.
Remember to bring extra warm, waterproof winter boots. Anyone without winter boots will not be able to go.
Also bring a warm, winter coat, heavy mittens, scarf or face protection, and a warm hat that covers your ears too.
You may want to bring some light-weight shoes for comfort in the cabin too.