Hi;
When I went for an interview a year ago to work for an airline in the Gulf, I had on my navy dark blue suit and a white shirt with a red tie. Maybe he can do the same or if he has a dark gray suit will do. It depends on the job he is seeking. If it is a senior management position then dark suits will do.
I wish that my wife had done the same for me
. He must be very lucky to have such a smart wife like you.
Good luck for the job.