Hi Cathpot
Are you doing hotel, chalet or self catering?
When your skiing then you normally wear layers underneath the ski jacket. I take skin tight long sleeve Lycra shirts and add a t-shirt over the top under a warm jacket. As you're new to skiing then you WILL sweat a lot so clean tops for everyday you are skiing. Underneath your ski pants it's usually joggers or long johns. If you're in a chalet or self catering then it's very much casual wear. If it's a hotel then add a couple of pairs of jeans. Skiers aren't normally too formal. Essentially, pack what you would for a week in a cold country, jumpers,t shirts, joggers, pants, socks etc
I normally wear one set of travelling clothes and an additional pair of jeans. I then wear what I'm going to ski in(minus Lycra top) the next day at night
So per person
Ski jacket x 1
Ski pants/salopettes x 1
Gloves x 1 pair
Goggles or sunglasses x 1 (although I take clear ones and dark ones for different light conditions)
Joggers/long johns x 1 per day skiing
Lycra/thermal tops x 1 per day skiing
Long socks for under the ski boot x 1 per day skiing
T shirts x 1 per day skiing x extras for non skiing/travelling days
Warm boots/shoes for walking about the resort/travelling.
Warm hats
Headover/ neck warmer/scarves for keeping the face warm in very cold conditions. Take 2 or 3 person.
The DC's will have to wear helmets(no helmet = no lessons) they are optional for you but wear one anyway. They can be hired in resort but Lidl and Aldi usually do cheap ones in the winter for kids. If your OH hasn't been for years then he may say adults don't bother, he's wrong. I'd say over 60% of adult skiers now wear helmets.
If OH can ski, get him to take a light daypack with extra fleeces for Cold days but you probably won't need. Kids will need w small bottle of water and w snack in their pockets everyday they are in lessons. You'll need the water too.
It's a lot of stuff/weight to get on a plane so wear ski jackets to travel, fill the hand luggage with stuff as well.