long trousers
long pants

He discarded his long trousers nearly a decade ago after a trip to China.

I am in long trousers now, and may speak to you as a man.

During the summer months, the long trousers are replaced with Bermuda shorts.

They were real grown-up long trousers exactly like those worn by the boys at the big school.

I'd have a suit with long trousers and a good pocket on the inside of the jacket.

She put on a pair of long dark blue trousers and a white T-shirt.

In 1997 upper secondary boys were allowed the option of wearing long trousers.

He was the last man to wear long trousers in a Wimbledon final.

He wore the long trousers that had come in shortly after the beginning of the century, and a top hat.

Robert, naturally, had given up the practice of kissing his father since he first went into long trousers.