Does it needed tuck in to go to an interview?

He already had the job. I bet he didn't dress like that when he went for the interview!

You should always dress well for an interview. Once you are well established then it won't matter. Stop and think yourself, if you saw two people. 1 was dressed in a suit and one was dressed in scruffy clothes. Who would you hire for an office job.

Yeah, I'd bet that doctor didn't dress like that when he interviewed for the job. Also, once you have a job, if you are exceptionally good at it, your employers and co-workers are likely to put up with small things like that. It's always good to dress up for your interview. My advice is to dress "a step up" from what is required for your job. If you are allowed to wear T-shirts and Blue Jeans at the job (such as at a factory or machine shop), then perhaps a nice pair of slacks and a nice shirt would suffice. If you dress in a suit in that case, you may seem out of place. But, if you are trying to get a job where appearance is important, then it's always best to dress up in a suit.

Look I'm retired from military service; first impression is the best way to get their attention. How you look after, is also important so keep it up. Well dressed, is the way to interview.

It really depends on the employers but sometimes dressing nice or smart casual is good too.