Advice needed on colder weather bike clothing.
As of last summer I have started riding my mountain bike a couple of times per week and enjoy it very much. Sometimes I ride around my neighborhood which is full of steep hills (I live in a Pittsburgh suburb) and on weekends I ride longer distances on the trails (usually 20-30 miles on the GAP - great allegheny passage that goes to DC ). I have been wearing bike shorts and a jersey since last summer but now that the weather turned I need winter clothing. I did some research on winter clothing and I m a little confused as to what I actually need. I plan on riding on fair weather days with temps as low as a little below freezing at the most. What clothing would be best? Long tights, underlayer and what kind, long sleeved bike jersey, and cycling jacket (what kind?) on top? Do I need a long sleeved jersey? Also any sites that sell these things competitively priced? (We all know that at the LBS these things are very expensive).
Any info is appreciated.