I'm not sure which novel 'the man in the brown suit novel' is specifically. There could be many novels with such a title or a similar description. So, unfortunately, I can't tell you the author.
I'm not entirely sure as I haven't read it in detail. But generally, it might be about a man who is characterized by the brown suit he wears, and perhaps his adventures, relationships or a mystery he is involved in.
Well, without more context, it's hard to say precisely. However, if it's a horror - themed story, the man in the black suit might be a symbol of death or something malevolent. He could be haunting a particular place, and the story could be about the people who encounter him and how they deal with the terrifying presence of this figure in the black suit.
I'm not sure specifically which 'the man in the suit story' you mean. It could be about a mysterious man in a suit who has some kind of special mission, or perhaps it's a story about a man in a suit who shows up in an unexpected place and changes the course of events there.