Waist
Lower Back
You approach the Moon in a helicopter and see a woman there on the surface, touching her waist. She's posing with one hand on her waist, like she's Sailor Moon or something. I guess that would explain what she's doing here on the Moon!
よう
こし
None
Once you get close, you see that her waist looks weird and… puffy? You realize she's stuffed some 子 sheep (こし) under her skirt's waistband to line her waist with them. Guess it's cold up here on the moon, so the 子 sheep keep her waist warm. And they had to be 子 sheep, otherwise they wouldn't be small enough to fit under her clothes.