I bought 2-4T for my little girl who just turned 3 years. She is of average height and weight and the pants fit perfectly. They are stretchy, comfortable and very thick. My daughter is so comfortable in them that she wears them all day even when she comes home and refuses to take them off. I have since bought two other brands but this is the best in terms of thickness, quality and fit. And contrary to some of the reviews I've seen here, luckily we didn't smell any.
Girls' Clothing and Leggings - Govc Winter Fleece Velvet Leggings
49 Review
Kid Nation Unisex Heather Charcoal Girls' Clothing for Leggings
52 Review
Slaixiu Leggings Fleece Printing GP777 3P B 130 Girls' Clothing and Leggings
54 Review
IRELIA Girls Leggings Modal Spring Girls' Clothing for Leggings
52 Review
C9 Champion Girls Supersoft Bright Girls' Clothing and Active
46 Review
Amazon Essentials Little Short Sleeve Leotard Girls' Clothing for Active
61 Review
Thermajane Girl's Cozy and Comfy Thermal Underwear Long Johns Set with Fleece Lining
46 Review
Hollhoff Gymnastics Playgrounds Shorts - Breathable Clothing for Girls
48 Review