For variable temperatures, arm and leg-warmer tubes are used by racing folk, easy to stow but can slide down some arm and leg shapes. I prefer full tights style leggings.
Lightweight core insulation: sleeveless gillet windproof or thin insulation.
Windbreaker: Featherweight, tight-weave nylon or polyester, light colour with some reflective bits.
Extra insulation: neck tube.

I alternate between insulating my legs and my upper body. Both ways work for me.