1. It is a cowboy's hat.
They are cowboys' hats.
2. It is an old lady's hat.
They are old ladies' hats.
3. It's a policeman's helmet.
These helmets belong to policemen. They are policemen's helmets.
4. This hat belongs to a clown. It is a clown's hat.
These hats belong to clowns. They are clowns' hats.
5. Those helmets belong to astronauts. They are astronauts' helmets.
