Why do little girls have to wear tops at the beach?

Anonymous
I have 7 year old boy/girl twins. I can easily explain that he wears bigger swim bottoms than she does because boys and girls are not the same below the waist.

But I can never explain to my daughter why she needs a top and her brother does not. I always just tell her “Eh, society.” She has the exact same tiny nipples that her brother does.
Why do little girls have to wear tops at the beach?
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