pant leg
trouser leg

I leaned back against the door and pulled on one leg of my trousers.

Larry beat out the fire that had started on his trouser leg.

He forced his fingers to open, to release the leg of the doctor's trousers.

He got ink down his trouser leg, but paid it no attention.

Then, all you will have to worry about is the width of your trouser legs.

The wound was just below the bottom of his trouser leg.

The floor and his trouser leg were suddenly dotted with red.

He pulled up his trouser leg and looked at the calf.

The child caught the slack of her father's trouser leg and followed.