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I've been told that it is inappropriate to not wear a suit to an interview. A suit will come in handy for the future, so it is really important to get one for interviews ... I wouldn't cut costs that way. Eat cup o noodles for the next month if you have to!
What about for neuroscience psychology PhD programs? Is a suit necessary when this is a jeans-and-t-shirt kind of job?
But seriously. Do they?