We ordered a medium size and it is too big for an 8 year old who normally wears a medium size. According to their size chart, the average size should be suitable for ages 8 to 11 (that's a big gap!). but I would say that leggings are more geared towards the end of that spectrum (for 10-11 year olds). However, if you like to sew, the waist should be corrected the most, as it is too high (reaches to the ribs).
Spotted Zebra Girl's Disney Star Wars Marvel Frozen Princess Leggings: Unleash the Fantasy!
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Slaixiu Leggings Fleece Printing GP777 3P B 130 Girls' Clothing and Leggings
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ZukoCert Fleece Leggings Cashmere 2P B 130 Girls' Clothing for Leggings
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Adorable and comfortable Splendid girls' leggings for kids and babies
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