I am a small adult - 5ft 1in, 125 pounds, athletic build. I bought these leggings based on a similar review because they are way cheaper than the adult version. Size XL fits great, not too tight and a bit long. They're perfect for running in cold weather - warm without being bulky or sagging.
Girls' Clothing and Leggings - Govc Winter Fleece Velvet Leggings
49 Review
IRELIA Girls Leggings Modal Spring Girls' Clothing for Leggings
52 Review
ZukoCert Fleece Leggings Cashmere 2P B 130 Girls' Clothing for Leggings
61 Review
Lilax Girls Basic Length Leggings Girls' Clothing in Leggings
52 Review
Tommy Hilfiger Girls Crop White Girls' Clothing
54 Review
Hollhoff Gymnastics Playgrounds Shorts - Breathable Clothing for Girls
48 Review
Pack Athletic Performance Basketball Drawstring Girls' Clothing
48 Review
Amazon Essentials Little Short Sleeve Leotard Girls' Clothing for Active
61 Review