((((Simon))))
I can understand that too. It's ashame you have to feel so unsafe around him. I'm really sorry about that. The only thing I can think of is to carry around a t-shirt and some jeans in a small bag or bag pack and have it next to you whenever you're out sunbathing. This way you can just jump up and put them on if he's anywhere near.
Is there anyplace else you can sunbathe? Like in a park or at somebody else's house?
Take Care