There’s a really old movie about an eccentric woman who gets awestruck at one point when she spots a workman in overalls with a loop like this - typically used to carry a hammer. She breathlessly exclaims about “the loop” being a sign of a master with in-depth knowledge and experience, almost like he’s part of a priesthood. I have no idea what movie that is. I can picture her face vividly but can’t come up with a name.