Which coat is the biggest?
The blue coat is the biggest.
Which sweater is the best?
The ... sweater is the best.
Which boots are the most beautiful?
The ... boots are the most beautiful.
Which coat is the shortest?
The green coat is the shortest.
Which trousers are the most expensive?
The green trousers are the most expensive.
Which coat is the cheapest?
The yellow coat is the cheapest.
Which trousers are the longest?
The brown trousers are the longest.
Which sweater is the smallest?
The pink and white sweater is the smallest.