What to wear, internal promotion interview.

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Hi, going for an interview tomorrow, going for the assistant manager job, currently I’m a supervisor.
I wear a company polo shirt for work, staff I supervise have shirts. I still have a company shirt, it'snot suitable for wearing with a tie though.
So, should I wear the polo shirt, this will be what I’d wear if I got the promotion, company shirt with no tie, or suit and tie?
It will be my manager, probably wearing a polo shirt, and another person interviewing. I guess the other will be more formally attired, I can't find out who the other person will be.

Thanks.

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Frontline healthcare, nhs.
I have suit or jacket etc, all options available!

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Suit it is then! It is in shift time, so I'll bring a suit in as well.

Cheers all.

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Just had the interview, I went with a suit, one of the other 3 did as well.

Seemed to go down well.

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Polariz said:

I've got a similar problem myself haha. I've somehow managed to end up having organised to have a lunch interview for tomorrow. However, tomorrow is dress down Friday. Can't wear a suit as it'll be...somewhat obvious to my existing employer, unless I pretend I'm off to court!

I got changed just for the interview, could you change in the car? Classy I know...

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Suit worked, I got the job.