There are many different types of clothes to match classy situations. For the classiest of situations, a man should wear a tuxedo. That is a no-brainer. But there are other times when you need to be classy, but not SO classy as to outshine everyone.
The best thing you can wear that says “I’m classy, but I’m not gonna embarass you,” is a turtleneck.
Wearing the turtleneck “naked” is always a good look, and is without a doubt the classiest way to look in a ski chalet. It shows not only style, but sensibility as you desire to keep your neck warm during skiing events.
If you wear the turtleneck with a sport jacket everyone will assume you are either a cool professor or a detective (both very classy professions!).
Either way, you win with a turtleneck.