It is more than being in the right place, at the right time, wearing the correct uniform. Being professional and have the right work ethic will allow students and potential employees to standout. This positive discriminator may be the determining factor for hiring, promoting and excelorating the satisfaction of job performance. Both professialims and work ethic are valuale traits.
I would say professionalism is an attitude that results in behaviors, like dressing approrpiately, interacting with others with courtesy and respect, and being on time for meetings and for work.
Students need to know, good work ethic goes along way in reflecting your values and character towards your work. Professionalism and Work Ethic is what employers need to keep synergy in the workplace and reduces conflict. Treat others how you like to be treated resepectfully.
It would be wise to teach the students that Professionalism doesn't just mean "I dressed up." It also means keeping up to date on technical and job skills, good communication practices, and being easy to work with.