From now on until March or so I'll be commuting mostly in the dark, though once the snow comes it won't really be that dark.

I don't like reflective vests, and have settled for:

on my bike: blinking white (almost blue - the yellow ones are a lot harder to see) 4 LED light in front, blinking red standard 3 LED in back - both quite broad and fairly visible from the side

on my helmet: a tiny steady-beam 1 LED light in front on my helmet, ditto blinking red on the back of my helmet... back-up in case the one on the bike gets obscured by mud or my jacket

Plus a broad reflective band on each ankle, to be visible from the side in crossings, and one on my left wrist to be extra visible when signalling a left turn.

I feel fairly visible, but I don't have much to see the road with, if the road itself is poorly lit.