I bought the 5T for my 4.5 year old daughter (35 pounds, 41 inches tall). There's definitely room to grow in length and width, so it's a bit big. Her waist and legs are so narrow that many 5T pants fall off immediately (but 4T is too short). That elastic waist feels like a good girth, but the legs appear taller/wider. But they are really cute, warm and comfortable. She loves them and I'm glad they have a little room to grow so they last a little longer.
Girls' Clothing and Leggings - Govc Winter Fleece Velvet Leggings
49 Review
Lilax Girls Basic Length Leggings Girls' Clothing in Leggings
52 Review
Kid Nation Unisex Heather Charcoal Girls' Clothing for Leggings
52 Review
IRELIA Girls Leggings Modal Spring Girls' Clothing for Leggings
52 Review