Size S: My daughter usually wears a size 6-7, fits well. I was so happy to see that Btween only sells their pants. These are the only pants my daughter will wear, but she has never been able to find soft pants that are sold separately. They're made of thinner material, have a lot of stretch, and are slightly raised at the waist (which my daughter likes so her underwear isn't showing).
Kid Nation Unisex Heather Charcoal Girls' Clothing for Leggings
52 Review
IRELIA Girls Leggings Modal Spring Girls' Clothing for Leggings
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Girls' Clothing and Leggings - Govc Winter Fleece Velvet Leggings
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Lilax Girls Basic Length Leggings Girls' Clothing in Leggings
52 Review