Fleece lined balaclava, a better all around I/O lense, gloves with better waterproofing for the pnw, bibs, headphones that don't fall put of my ears, pow baskets on my poles
baby wipes, never know when you need to take an emergency dump, or there is the traditional method of plan ol' snow if the constancy is acceptable to your liking
Lens that does the same thing as transiting glasses. I can't see anything half the time I'm skiing. I lean back, point it straight, and hope for the best.