where are all the naked people?

[*purp]

ive tried to look up a guide to this challenge as ive explored as much of the map as i can but there arent any guides. can anyone help??

[rogut3]

https://steamcommunity.com/sharedfiles/filedetails/?id=2773505573

[rogut3]

https://steamcommunity.com/sharedfiles/filedetails/?id=2773505640

[rogut3]

https://steamcommunity.com/sharedfiles/filedetails/?id=2773510236

[Inv!sible]

another one in the public toilet (blue doors) in the city center not far from the retirement home
https://i.imgur.com/nBtFXTo.jpg