in a comical scene the children run out of school, the boys naked (many cover their private parts with their hand) and the girls topless,then they return to class to get dressed after being scolded by an embarrassed teacher.
Jonsy skinny dips. We see her bare shoulders only. Martha Plimpton presumably wears skin tone swimwear in the part of the scene where she runs "nude" towards the river.
Lydie (Sandrine Bonnaire, 17) gets naked in front of a man to take a shower. She gets out of the shower and puts on a robe. She rubs the robe a bit on her wet body but doesn't close it. She stands next to the man, giving him a full frontal view.