Tis the season for the flakes that dont melt....
I suffer from dandruff in the winter, I have dry skin. No shampoos seemed to work and the best defense I had was applying Cetaphil moisturizer directly to my scalp after showers.
While picking up some Proraso products at Target I bought their no frills brand of Dandruff shampoo that had an active ingredient of 0.5% coal tar. I can't remember the brand name but it was fairly expensive. The target knock off was about $5 for the bottle.
The stuff is fantastic. It literally smells like hot asphalt but I have not had a single flake since using it. I am a pilot and wear black vests over my uniform when its cold and flakes really used to bother me...but not anymore.
Definitely worth trying if you suffer from dry skin/dandruff.