This is an important day, and you have to make a good impression. Using dark colors is always a good idea, and is the typical for interviewees. There are no specific requirements on how to dress, but you should try to look professional and neat. Your wardrobe won't be assessed, you will, so do not pay excessive attention on this and avoid eccentricities that may attract the attention in a negative way. Just attend the interview well groomed, with a nice and clean suit/dress, and focus on performing well while you are at the hospital.

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