@ChuppaChups I would recommend you budget for heated wearables or packs rather than expensive clothing.
The stuff that produces good heat is going to help you feel warm.
The clothing and layers is more to not get the cold wind in and chill you. It doesn't make you warm.
Some people run cold and some people run warm if you get what I mean. If you are the type that feels cold in Singapore when it is 20 degrees then you really need the heat producing stuff not just insulation . Your body don't produce enough heat to keep you warm the insulated clothes has no heat to keep in.
You get what I mean?