If you're first time skier, may as well just rent ski pants. I would say purchasing a ski jacket via taobao is economical and reusable, we wear them during winters in HK. Must use ski goggles due to the sun ray reflections is huge in ski field, is harmful to eyes. You can purchase them via taobao.
My family has our own ski wears and goggles and gloves, we got them from taobao. The quality is very acceptable.
We don't wear down jacket, when you're skiing, it's sweating, furthermore there's heater everywhere indoor, it would be too hot. Wearing fleece vest and a windshield ski jacket (with many pockets) are fine. The key is your clothing inside the jacket must be just fit, not loose, to block away wind. Fleece can be warmer than down jackets.
2 years ago, the lotte department wasn't opened until after 4th cny holidays, however the DFS floor was still opened to tourists, mainly Mainlanders, during cny holidays. Most street hawkers were opened.