Our expert says:
This is not abnormal behavior and making a big deal about it or punishing them will only draw attention to the situation. It may be helpful to sit with the elder of the two and explain in adult language that it is just not appropriate in public. Do not talk down to her. Getting children to explain why they do what they do empowers them and gives them a sense of control in an otherwise adult controlled world. Get her side and then explain your side. The two year old is only copying her elder sister. Your friend might try to find some kind of compromise. Let her walk around naked in her bedroom or at certain times of the day, but don't create a control issue here or the behavior will only mutate into something else.
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