One of my favorite stories of my now 27 year old daughter was when she was about 4. I was giving her a bath and had to run to answer the phone. When I come back I hear her jumping on her bed (strictly forbidden) and singing something. So I tip toe to her door and peek around corner. Sure enough she's not only jumping on her bed, she's butt-neckid and singing:
"I'm neckid and free and I love being neckid and free."
All the while, she's jumping and spinning. Then she bends over and looks between her legs and sees me standing in door and her mouth drops open. I still have that image of her in my head. Bare butt, bent over, looking at me upside down from between her legs with that "OOHHH SHI...." look on her face.
Today we still sing song "I'm neckid and free" when we want to tease her. She doesn't even remember the incident but it's one of my favorite stories. Funny thing is she had never shown any signs before or since of loving being naked and certainly doesn't today.