I think that I have seen television scenes in some sort of play setting where children wear velcro covered clothing and throw themselves at velcro covered walls and sometimes stick to them.

I found an article with the history of velcro walls.

http://www.airfungames.com/party-rental-resources/velcro-walls-history[1]

Apparently velcro is strong enough to stick even adults, heavier than children, to walls.

And an improved and stronger velcro prison suit could stick prisoners to improved and stronger velcro walls so hard that the prisoners would be unable to free themselves from the walls until and unless the guards pulled them off.

I think that I have seen television scenes in some sort of play setting where children wear velcro covered clothing and throw themselves at velcro covered walls and sometimes stick to them.

I found an article with the history of velcro walls.

http://www.airfungames.com/party-rental-resources/velcro-walls-history[1]

This article says that heavier people don't stick to the walls:

Philip, not quite tall enough to jump on the wall by himself, was hoisted against the Velcro by Sportland's two wall attendants, Joe Laroche and Fernando Martinez, both 18.

"Little kids usually stick, but we have to hold older people because they weigh more," said Martinez, who calls himself "Velcro Man."

"This one guy weighed 200 pounds plus. His foot went right through the seam in the floor. . . . Usually at 150 pounds you stop sticking. It throws you right off. So when someone big comes along, I'll be sure to ask Jack {Goldstein} for my break."

After wall jumpers put on their suits and pay $3 for three jumps, Martinez and Laroche usually ask which way they want to hit the wall. Grabbing the participants by the bottom of the canvas suit, Martinez and Laroche help the jumpers gain momentum from the ground and make sure they stick to the wall. After the jumpers remain on the wall for a minute or two, they are peeled off and returned to the ground.

https://www.washingtonpost.com/archive/local/1993/06/13/area-daredevils-newest-shtick-velcro-jumping/f50ab536-db2c-45de-a4d7-8c5f6f2a6a6b/[2]

And an improved and stronger velcro prison suit could stick prisoners to improved and stronger velcro walls so hard that the prisoners would be unable to free themselves from the walls until and unless the guards pulled them off. Apparently it is normal for the attendants to peel customers off the wall, not for them to free themselves from the wall, so with stronger velcro-like materials prisoners wouldn't be able to release themselves from the prison walls.