Answer:
What dress does everyone have, but no one wears?
The more it dries, the wetter it becomes. What is it?
What is shaped like a box, has no feet, and runs up and down?
I hold two people together but touch only one. What am I?
What is black when it's clean and white when it's dirty?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.