My 7 year old wears a size 8 leggings in Old Navy due to the length. I love that her leggings fully cover her ankles and don't ride up too much when she sits down. I tried 8-9 and they are perfect. She might fit a size 6-7 but the leggings definitely come down to her ankles. Leggings 8-9 are the perfect length and should be the right length for the school year. The skirt is quite short so I'm glad I went up a size so it went up a bit. Not 5 stars because threads came loose after washing. Hope these hold up!
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