What Do I Wear?
You're about to start spending entire days on a mountain in the middle of winter, working hard at having fun. Yes, you'll need the right clothing to keep you riding (while all the chumps in the lodge huddle around the bathroom hand dryer).
1) Fabric is everything. Shop for waterproof and breathable materials that keep the outside elements out while letting you decide where and when you want to dump the excess heat and moisture created by ripping hard.
2) Get a good pair of gloves and pants. As a beginner, you're going to be spending time on the snow and pushing off of it to stand back up (it's not like you have poles to cheat with).
3) Look for mobility and minimal bulk. Feel like the Stay-Puft Marshmallow man? That's no good. You'll need range of motion to jump up and down and spin around, not to mention the ability to bend over and strap into your bindings without splitting a seam.