Keep her warm under a snowsuit with girls base layers from Deux par Deux. Choose a two-piece merino wool set in dusty pink, blue gray or black, or a one-piece thermal underwear jumpsuit in thick brushed jersey with a smiley face, purple gradient or pink watercolor flower print.

The merino sets pair a long raglan sleeve top with a pull-on pant with an elastic waistband, in sizes 2/3 to 12/14. The one-piece suits have an asymmetrical zipper and run from 6 months to size 14, so younger sisters can match too; for more baby styles, see baby girls base layers.

Wear them under girls snowsuits for ski days and recess, add mittens and gloves to finish the outfit, or find more cold-weather pieces in girls winter clothing.