I used measurements to order my daughter the medium size she wears at all other brands (Old Navy, Walmart and Target leggings) . These leggings were so small and tight and short that she could barely put them on. These are very thick good quality leggings so I order a size larger than two spare pants to see if they fit. The compression factor is definitely there and that's probably why they seem so small. These leggings were probably 4 inches shorter than the typical full length leggings from other brands (like Old Navy).
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