Looking for Husky pants with elastic waist bands

My little boy is 3 and a half years old and he has not mastered buttons on his pants yet. He is going to preschool and they have chapel on wednesdays and they have to wear a uniform. The uniform pants at the Parker store are 22-35 dollars a pair. I am looking for husky uniform pants with a elastic waistband all the way around not just in the back. Thanks

Wal-mart? Kohls?

Sears or JC Penney?

Check out Land's End catalog or on line. Their clothes are sturdy and well made, and prices aren't bad considering quality. I think they started a school uniform line a few years ago.