Usually, dependent on temp:
65-80+ - feet, black regular cycling socks, no overshoes, since at these temps my feet won't freeze if wet
legs, mild pre-ride balm, thin smear of vaseline, no knee warmers
55-65 - feet, smartwool light socks, defeet overshoes
legs, pre-ride balm, thick layer of vaseline
45-55 - feet, defeet wool socks, PI overshoes
legs, warm pre-ride balm, knee warmers
In the past, I have not ridden in rain conditions below 45. For the future, I have bought a pair of iBex leg warmers made of climawool in front, which will allow me to zip over my overshoes. I also bought a pair of DeFeet wool knee warmers for when its cold but, not freezing. I have yet to try these out since its been mild in the NE.
The above is for training rides (1.5-3hrs). For short commutes and such, I have 3/4 knicker pants or rain pants available if need be.