I think the only time a nightgown is not tznius is when you are rolling around in bed and it hikes up during sleep. I don’t imagine that a girl’s father or brother is coming into her room to daaven or learn there, so that doesn’t seem to be the issue. But just for the sake of being tznius, it would be a good idea to put on the pants of the pajamas under the nightgown, but unfortunately things seem to have swung to the other side of the pendulum and daughters in frum families are sometimes only wearing the pajamas and the nightgown has been forgotten.
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