Many ballerinas in costume have tights that match the overall outfit, so doing a plain white wouldn’t have properly fit for a performance outfit (normally). They may have done better making them slightly darker, as the tights don’t often cover completely as though they’re leggings, but overall the color match is correct for it being a performance costume.I can see a difference when I look at my artemis avatar to this avatar. It does come across more peachy versus straight skin tone. I'm sure they just dropped the colors in from the dress onto her legs. But I think overall it does look incorrect. I can see where they were going with it, but it would be nice if they changed it. The leggings would make more since if they were white with warm lighting bouncing off. The leggings could also be brown. Or apply a texture of some sort. I dont think ata intentionally did this by any means. I'm sure all the art is done on layers, and color filling legs (to make leggings) by picking up a color from the dress is very easy to do. But it's hard to unsee the legs as being two different avatars smashed into one.
I thought the avatar might be Misty Copeland inspired. She has beautiful ballerina photos and she wears white leggings etc..