Sentences with Old Hat

He found the traditional approach to solving the math problem old hat and sought a new method.

Memorizing multiplication tables may feel old hat with the availability of calculators in today's classrooms.

In the world of technology, flip phones are now old hat.

Printed encyclopedias are now old hat in the age of easily accessible digital information.

Wearing a costume from last year's party would be considered old hat at the upcoming Halloween event.