I don't think
LizzyM is saying they disagree with the dress code of a particular school, but rather, on a more sentimental level, there is nothing 'unbecoming' of an aspiring physician to wear something other than a full on suit. Likewise, the onus is on the applicant (i.e., the person climbing the ladder) to 'dress to impress' but once they've reached a certain level in their training, the judgement is not on appearances so much as it is on ability. I can't tell you how many times (either as a patient, or volunteering, or shadowing) I have seen physicians wearing slacks or khakis, with a button down shirt, sometimes a tie, sometimes no tie.
I will always be a scrubs and sneakers kinda guy myself. Nothing better than a pair of comfortable pants when you are in the cath lab for hours on end. Then again, maybe I'l find myself most in my element in this attire: