This may seem a sillly question but I've 2 dds, 6 & 3. And today they were out in snow a lot. But were freezing and had to change them each time. Eldest had on thick sock and snow shoes, trackies, 2 tops and water proof jacket with fleece. DD 3 had on similar. Do I buy ski wear (not a skiing family) in the likelihood this will be a harsh winter or go for water proof trousers and lots of layers?