Crawling sell special needs equipment - including Houdini harnesses for children with ASD etc who get out of usual ones.
They sold me a harness for my severely autistic son years ago after he ran out of a shop while I was paying & straight into a road. That harness was a godsend for a number of years as I could slip the strap through my arm and use two hands - eg to pay & he couldn't run off.
He no longer really needs one 99% of the time but a lot of his peers (all teenagers now) do still use them.