If I don't think they can be worn without a long top that covers the child's bottom, then they don't quite belong with "leggings" or "pants". In fact, these are very thick tights. I returned them as they were not what we were looking for and my daughter did not find them comfortable. However, if you are looking for tights, they are very thick and I think they will be very warm.
Kid Nation Unisex Heather Charcoal Girls' Clothing for Leggings
52 Review
Lilax Girls Basic Length Leggings Girls' Clothing in Leggings
52 Review
Girls' Clothing and Leggings - Govc Winter Fleece Velvet Leggings
49 Review
Slaixiu Leggings Fleece Printing GP777 3P B 130 Girls' Clothing and Leggings
54 Review
Tommy Hilfiger Girls Crop White Girls' Clothing
54 Review
Thermajane Girl's Cozy and Comfy Thermal Underwear Long Johns Set with Fleece Lining
46 Review
C9 Champion Girls Supersoft Bright Girls' Clothing and Active
46 Review
Dancina Toddler Leotard Flutter Sleeve Girls' Clothing for Active
55 Review