My pregnant après-ski layers:
Moon Boots Luna Water Repellent Genuine Shearling Boot
H&M Mama before and after sports leggings (my favorite maternity leggings ever)
Merino wool tank top
I also linked a few warm leggings (non-maternity) that look great with UGGs and winter boots!
LTKShoeCrush LTKBump LTKSaleAlert