Ummmmm there is nothing wrong with a black suit. A checked shirt will be fine. You should prob wear black shoes, but I can see tan ones working too.
Maybe rather than a black tie, wear one that picks out a colour in the shirt to soften the look. You could also wear a fine cardigan in a contrasting colour under thye suit jacket to add a touch of flair.
Also, google image search "black suit" and see what looks inspire you.