I spent years trying and eventually conceded that if you’re going to ride for a decent time in the cold and wet…you’re going to get cold and wet. Embrace it! 
Even if you keep the rain and mud out, your sweat cools and has the same effect.
That said, you can improve things. Your feet or hands are the symptom, but not likely the cause - you need good cover for your limbs and core, even if that makes you feel a little too warm. Just drink more.
Multiple layers on the legs in particular. 