Purely based on my own experience last week, bare in mind it was quite sunny at times.
1) Jeans, boots/trainers t-shirt or a jumper, coat. Alot of people where still in their ski clothes.
2) I only wore a t-shirt all week under my jacket. On the other hand my wife wore her thermal bottems and a fleece.
3) sunglasses most days apart from the 1 day it snowed heavy. Goggles were a must that day. My cheap pair from aldi were great