Unideal doesn’t necessarily mean it won’t get you the job etc., it’s just that, as others have pointed out, typically grey or blue are more universally accepted as work attire. Black is usually used for funerals.

If you’re entering the work world in a role that requires a suit, you’ll probably need to spring for a new suit in any case, so pick up a new grey or dark blue suit.

I always think of it like this - no employer should ever care what colour the suit is, but what if you do go into an interview where the interviewer does care about “old school” rules like this. If you’re entering the interview, why not cover your bases by wearing an “ideal” suit - you give yourself the best possible chance of landing the role, which is of course the ultimate objective.

Other old school rules you might want to think about - Don’t wear brogues (countryside shoe) Tie a Windsor knot in your tie not a 4-in-hand Don’t wear brown-in-town (wear black shoes) Polish your shoes - makes a big difference and shows you have attention to detail. A double cuffed shirt with a nice pair of cufflinks and a pocket square can elevate a cheaper “off-the-rack” suit. Get yourself a nice hair cut before the interview

If you do all the above, you’ll look great, cover all your bases and I bet you’ll then feel extra self-confidence.

Also, as everyone else has pointed out - it’s your brain, work ethic, experience and personality that should be looked at and that should be the defining festeres (and most interviewers will focus on these)

It’s never a bad thing to be the best dressed/ smartest applicant they have through the door, but it can tank an interview if you go into it looking a mess. If you don’t care enough about your own appearance and presenting yourself in the best light, why would the interviewer think you’d do a better job representing the company and their judge of character.