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Regarding the dress code tip, I definitely agree that it is potentially a VERY bad first move to show up for your first day at work (IT or anywhere) in jeans and T-shirt without first confirming that this is indeed the norm for that company. However, I completely disagree that it is bad, let alone worse, to show up for your first day in the business attire of suit and, for men, tie. You can always take off the jacket and tie if it turns out you are overdressed, then have a good laugh about being the new guy or whatever and this is part of your training. You will make a MUCH better impression by making it obvious that you took some care with your appearance than if you just assume that jeans are cool. Hopefully you were observant enough during your interview phase to notice what others were wearing and then confirm with your new boss what is appropriate.