Disclaimer: This article is only for experience sharing, not bragging.
In 2010, I went to Switzerland with my mom and sister. We went to the snow by an underground train through a mountain. And believe me, it was freezing cold. I had to wear a sleeved T-shirt, a normal jacket, and a big layered sweater. I was still freezing, though. But do not worry. There was a place near the destination which is completely warm. They sold garlic bread with some cream soup. They also sold cocoa milk. The place also had some fun rides too. They had this scary looking but fun zip line which is awesome. It also has a slide which is made natural from real life snow. It was amazing. I would totally recommend that place.