I walk around naked or half-naked all the time when no one's home because I know (or think I know) that no one can see me and I'm in my own private domain.
I don't see why he had to be arrested for being naked in his own home. It's not like he was in his backyard flaunting himself.
The woman and child obviously had to be on his property (which they probably shouldn't have been) and nosy enough to peek inside his private window.
I hope he's not charged. He didn't do anything wrong.