Answer:
Fashions change, but what can a person wear that is never out of style?
I go in hard, come out soft. Blow me hard and I'll make a pop. What am I?
When you buy me I am costly, but the only use I have is hanging only. What am I?
I am the signature stroll of ducks and penguins
Use me if you really want to see inside someone
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.