That's cool! I like RFK for personal reasons -- I can relate to him more than the other Kennedy's despite not even living while he was alive. I turn 18 in a month, for context. And there's a really good book of pictures of RFK. It's a book of photographs throughout his campaign and you can see his style pretty well throughout it all.
It's called "A Time It Was: Bobby Kennedy in the Sixties." It's $2.50 on Amazon + shipping. And while it's not a book on his style, the photographs are ones that I can't find online at all.