DS has got a job interview for a management trainee scheme at a hotel chain (- would be first "career" type job since graduating from university). He is anxious to dress appropriately for the interview.. He is thinking suit and tie. He has a suit, the colour of which I would describe as "airforce blue". Does that sound OK? (He is looking to me for advice, but I have worked in the same job for years and years, so am out of touch re what people wear for job interviews these days.)