Some new skiers ask about staying comfortable while skiing.
Cross Country skiing is near and dear to me. I find that most folks wear too many layers. I always bring my North Face pack with a hydration bladder. One thing to note: the tube will freeze, to I use an insulated cover. I got the hydration bladder at EMS.com
My downhill kit feature an EMS system 3 shell, and under that I wear thin polyester filled jacket. Eastern Mountain Sports System 3 has little snaps that attach the cuff and at the neck line.
Spider.com manufactures ski specific clothing. For downhill, I splurged on a Spyder ski sweater.