Whenever you give a presentation in school, go to a job interview, go to a networking event, or interact with engineering professionals in any way (outside of the classroom) it is important to look professional so that you make a good impression. Looking professional can vary across companies and situations. It is important when decided what best to wear that you understand that working culture of the firm or company you are hoping to wow (*jazz hands*) at your upcoming in-person interview. Are you interviewing with a company that has traditional culture and values with all of their staff pictures online in suits and business formal dress? Then it is likely that you should "Dress the part that you want" and match this company’s culture. The counter-example is prevalent in the software "tech" world; some companies frown on overdressing as possibly compensating for lack of ability or skill. Business casual is a good happy medium; in other words, no holes in clothes and save the vampire teeth for Halloween.
As stated above, business casual will be a good professional dress for most situations including career fairs and interviews. (Always ask ahead of time when you can!) This is not a comprehensive list. Instead, it is a rough guide for how to dress in business casual:
