You guys will all get an email a few days before class starts telling you that you must be in business casual for all activities relating to the company. This includes travel to and from airports, while on airlines to your departure destination or training. Etc. You must also be clean shaven for all company related activities.

A good rule of thumb for any job is to never dress any lower than the standard uniform or dress code. Don't want to show up in jeans to a job where thats not even allowed on a normal basis!