Sorry, you don't really wear a top hat with a smoking.

thanks, I really didn't know

No prob. With a smoking, you can either wear a black Homburg, trilby or (a bit more unusual) bowler hat.

A black top hat requires either white tie or dark morning dress. Lighter morning dress can be combined with a grey top hat.

Hope that helps

thank you very much, it's always good to learn something new everyday