A common critique of students and employees is, "They know a lot but they don't how how to apply and communicate what they know." The professionalism triangle is all about fixing this and does so using the three pillars of knowledge, application, and communication, built on the foundation of tenacious hard work. The video also covers how classes need to teach students how to learn and applying knowledge "in the same breath."
Why English Majors Get Great Jobs
English Majors get great jobs because they have the skills that many employees are looking for: the ability to critically analyze and communicate.
Dressing Professional You
A perspective to consider: you should dress like the professional version of you, because if this really is the dream job that is perfect for you, shouldn't you show up as your true self? There are of course many exceptions to this idea, but it is worth considering.