Best place for ski/snowboard stuff is ebay. Some bargains out there if you know what your looking for.
Dont be fooled into thinking you need super tech outerwear for skiing, anything of 5k or above waterproof/breathability will be fine as its pretty dry normally. Baselayers are a good investment if you dont already have some. Proper socks – yes.
Fit – Baggy for movement/style although some of the cool kids are now wearing skinny fit sytle pants!
Baselayer, t-shirt, hoody, jacket will be fine for most conditions. I'm a bit fan of long-johns too!