Bibs, shell pants or stretch fleece pants should cover your first layer. These can be stored easily rolled up in a fanny pack kept around your waist. Cross country skiers most likely will need fewer layers than downhill skiers, but it is just as important to have breathable fabric that moves moisture away from the skin. Flexibility and versatility are critical for comfort in cross country skiing, as you often become warmer and stay warmer during this high energy sport, with no chair lifts to cool you off. Often an inner layer with one good outer layer is enough, especially as some manufacturers offer one garment that includes both a layer of wind protection between layers of fleece, such as The North Face.
Synthetic material is best here too.
Hats made of fleece and gloves or mittens lined with fleece and containing Gore-Tex are excellent choices for warmth and breathability. Socks should also be made out of synthetic moisture-wicking material rather than cotton or wool. Eye protection is critical in skiing and one should always wear goggles or sunglasses. No matter how many layers you put on, parts of your skin are most likely going to be exposed to the sun, especially your face. Don t forget to always wear sunscreen, even on cloudy days.