These should be knee high, with a drawstring to secure them just below the knee.
The man on the bed groaned loudly and elevated one knee high in the air.
I've been that ever since you was knee high to a duck, Phyl.
At no point was it more than waist high and in some places only knee high.
He wore whip-cord jodphurs—protruding widely on either side of his plump thighs—and knee high leather riding boots.
Since I been knee high to a grasshopper, I ain't never done nothin' but wuk 'round white folks' houses.
The fact was, I had not thought of most of the hymns our sixth floor sang since I was knee high.
I've tumbled in mill races, and been yanked out of ponds ever since I was knee high to a duck.
And he'll treat you as if you were a real life-sized human being instead of a job hunter, knee high to a copying clerk.
The second was a low fast one, about knee high, just the kind he was accustomed to “kill.”