What's this?
It's a (leather) jacket. It's a (brown) jacket. It's a (brown leather) jacket.
What material is this?
It's leather. / It's a leather belt.
What's this?
It's a (cotton) dress.
What are these?
They are (brown) (leather) shoes.
What's this?
It's a (green) (wool) sweater. It's a (black) (leather) hat.
What's this?
It's a (wool) jacket. It's a (plaid) jacket.
What's this?
It's a (brown) (leather) belt.
What's this?
It's a (leather) dress. It's a (black) dress.
What material is this?
It's rubber. / They are rubber boots.