Clothing will be similar to hiking but expect more wind (moving faster on a bike) and more sweating (usually working harder on a bike).

For really cold days (~20F), start with a base layer, another insulating layer, shell jacket/pants, good windproof gloves, wool socks, boots or insulated shoe covers, and a head covering. How much clothing to wear depends on the temperature/wind and how hard you're working. Something you'll have to try yourself to get dialed in.