>>1577378>Fahrenheit ?anyway layers are good, they can be added and subtracted as needed, and do not take up so much bulk as heavy clothing
but you do not want to over heat as sweating will just make you colder, a little bit of ventilation goes a long way
wind chill also hits different parts of the body first
roughly in order of when numbness sets in
ears then nose then cheek bones
hands then forearms - by this point you should take a rest, dry out and slowly warm up, if you get any colder its gonna be a bad time
if your pedaling all the time your legs do get warm so they need less protection from the cold, I sometimes bike in shorts or thin leggings but with everything else thickly covered
however when ever you slow down or stop biking you will need leg insulation so carry thick trousers with you
else you might be able to find some trousers that can be folded or converted to shorts then back again
in the extreme of cold or speed you may want to get some ski goggles, anything not alike to this fogs up
and face coverings, tho a full balaclava is not always needed
https://bekogear.com/face-masks/ 