Any suggestions for objects/activities to occupy the fidgety hands of a man with advanced dementia?

My dad is in a nursing home with advanced dementia. Apparently he is constantly fidgeting with his clothes and ripping them. We have purchased sweat pants without a string and pullovers with no zippers or buttons and that has helped. But he still seems to want to do "something" with his hands. Just curious if anyone has ever run into this and if they found any objects that helped? As I write this I remembered as a little girl having a "dressy bessy" and "dapper dan" doll where you could learn to dress a doll. I'm not sure that would work but it popped into my head just now. Any other ideas?

Thanks in advance!