Ski trips present quite a packing challenge. This photo was taken 14 years ago, when the fam and I were all a bit younger, and a few pounds lighter. Geessssssss, it was even before gray hair. sigh
Packing a necessary evil of any and all trips. What to take, how much to take, how much does it weigh, will it wrinkle. First thing to consider is are you driving, or flying. If you're flying that bumps up the difficulty factor. If flying you have to think about weight, how to protect items, how to keep clothes presentable and still have all you need.
Our method of packing for ski trips was a clean turtleneck a day. After skiing, showering for dinner the clean turtle neck for dinner was the one you wore to ski in the next day. 2-3 sweaters was enough for the whole week and maybe 2 pair of jeans. Remember packing your ski equipment takes space so it gets the priority. And, you're wearing your ski clothes the bulk of the time, so you whatever else you're wearing are items used for a short period of time.
Pack ski socks and long johns, which are bulky items in your ski boots, and around your skies. It saves space in your suitcase, and protects your equipment.
**Always pack lots of lip balm, and cloth handkerchiefs/bandannas. Paper tissues don't hold up well outside and can't be used to protect your face or neck.
Folding your dirty clothes for the return trip will make packing easier too. Put them in a plastic bag, but folded gives you the same space you had when you packed the first time. If you have undergarments that are on their way out, you could through them out instead of packing them for the return trip; which frees up space for items you purchased on the trip. Personally I've not used the throw away method; but know several people who have and it worked well for them. People tend to buy new things for a trip and they did just the opposite. Took old stuff, wore it, pitched it instead of packing it to bring home.