Riki is first seen nude when he undresses and pretents to be in a picture.

Riki is undressed by a woman, she then puts his night shirt on for bed.

Riki, Bert, Nina and Katinka go skinnydipping.

After he got his clothes wet Riki is forced to wear a dress at first he's not happy but later he is waking in the wood and meets a woman who talks to him. Then he's happy and starts to dance (the dress is see through and lift up, when he's jumping he has no underwear on).